Immer.js performance

[Dassderdie]

TLDR:

I did a little experiment + benchmarks and wanted to share the results just FYI. Because of the FYI character of this, I created a discussion instead of an issue.

We could improve the performance of all our reducers by 3 to 4 times by just switching libraries.

Intro

Immer.js is the library on which all our reducers rely.
Its produce-method "converts" mutable reducers (the input value is mutated) into immutable ones (the input values are not mutated, and instead, a new copy with the changes is returned).

One alternative to immer.js is mutative. It has fewer features and bit different names, but aims to be more performant than immer.js.

Setup

I replaced produce from immer with create from mutable (d8d3869 and 02e3ac8). This was basically a drop-in replacement, as we didn't use any of the advanced features of immer.

Test Setup:

  OS:      Windows 11 Pro 10.0.22621
  CPUs:    12 × AMD Ryzen 5 5600X 6-Core Processor
  RAM:     16309MB
  Node.js: v16.19.0

Results:

Detailed outputs

immerjs

empty-state-version-14.permanent.json
  migrate:                    11ms      5ms       7ms       9ms       6ms       4ms       4ms       3ms       3ms       3ms       
  validateExercise:           53ms      39ms      26ms      23ms      13ms      11ms      9ms       9ms       10ms      9ms       
  newImmerDraft:              0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms
  sameImmerDraft:             1ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms
  noImmerDraft:               1ms       3ms       1ms       1ms       1ms       1ms       1ms       1ms       1ms       1ms       
  benchmarkActions: [Client] Add client: 0.10ms
  numberOfActionsPerType: [Client] Add client: 1

exercise-state-2022-05-31-small-demo.json
  migrate:                    145ms     109ms     100ms     100ms     104ms     99ms      99ms      99ms      101ms     103ms     
  validateExercise:           257ms     209ms     204ms     205ms     207ms     233ms     197ms     203ms     200ms     205ms     
  newImmerDraft:              548ms     535ms     530ms     530ms     545ms     539ms     528ms     530ms     540ms     520ms     
  sameImmerDraft:             85ms      74ms      73ms      72ms      73ms      74ms      77ms      74ms      76ms      74ms      
  noImmerDraft:               6ms       6ms       6ms       9ms       5ms       6ms       7ms       7ms       7ms       6ms       
  benchmarkActions: [Exercise] Tick: 505.11ms, [Personnel] Move personnel: 10.25ms, [Patient] Move patient: 6.04ms, [Material] Move material: 2.98ms, [Vehicle] Unload vehicle: 1.98ms, [Patient] Set Visible Status: 1.55ms, [Vehicle] Add vehicle: 1.27ms, [Vehicle] Move vehicle: 0.98ms, [Transfer] Add to transfer: 0.75ms, [Vehicle] Load vehicle: 0.70ms, [Hospital] Transport patient to hospital: 0.39ms, [Transfer] Edit transfer: 0.25ms, [Client] Restrict to viewport: 0.17ms, [Client] Set waitingroom: 0.15ms, [Client] Add client: 0.13ms, [TransferPoint] Move TransferPoint: 0.11ms, [Client] Remove client: 0.09ms, [Exercise] Pause: 0.07ms, [Exercise] Start: 0.07ms
  numberOfActionsPerType: [Exercise] Tick: 1079, [Personnel] Move personnel: 29, [Patient] Move patient: 18, [Vehicle] Move vehicle: 15, [Patient] Set Visible Status: 11, [Transfer] Add to transfer: 10, [Material] Move material: 10, [Vehicle] Add vehicle: 9, [Vehicle] Unload vehicle: 5, [Client] Add client: 3, [Client] Restrict to viewport: 3, [Client] Set waitingroom: 3, [Transfer] Edit transfer: 3, [Client] Remove client: 2, [Exercise] Start: 2, [Exercise] Pause: 2, [TransferPoint] Move TransferPoint: 2, [Vehicle] Load vehicle: 1, [Hospital] Transport patient to hospital: 1

exercise-state-2022-05-31-workshop-babz-großes-szenario.json
  migrate:                    724ms     700ms     694ms     688ms     744ms     680ms     709ms     781ms     695ms     684ms     
  validateExercise:           1645ms    1883ms    1627ms    1625ms    1662ms    1674ms    1570ms    1577ms    1611ms    1642ms    
  newImmerDraft:              5803ms    6135ms    5687ms    5665ms    5793ms    5724ms    5658ms    5779ms    5783ms    5774ms    
  sameImmerDraft:             510ms     532ms     526ms     539ms     524ms     516ms     514ms     514ms     538ms     520ms     
  noImmerDraft:               81ms      80ms      78ms      81ms      78ms      79ms      81ms      80ms      80ms      86ms      
  benchmarkActions: [Exercise] Tick: 4992.40ms, [Patient] Move patient: 215.10ms, [Personnel] Move personnel: 177.14ms, [AlarmGroup] Edit AlarmGroupVehicle: 119.66ms, [Material] Move material: 93.12ms, [Vehicle] Unload vehicle: 30.81ms, [Vehicle] Move vehicle: 29.46ms, [Vehicle] Load vehicle: 27.92ms, [Vehicle] Add vehicle: 18.16ms, [Patient] Add patient: 16.63ms, [Patient] Set Visible Status: 15.61ms, [Transfer] Edit transfer: 12.10ms, [Hospital] Rename hospital: 11.04ms, [Hospital] Transport patient to hospital: 10.99ms, [Transfer] Add to transfer: 10.15ms, [TransferPoint] Move TransferPoint: 4.73ms, [AlarmGroup] Add AlarmGroupVehicle: 4.71ms, [TransferPoint] Connect hospital: 4.21ms, [TransferPoint] Rename TransferPoint: 3.74ms, [TransferPoint] Connect TransferPoints: 3.58ms, [AlarmGroup] Rename AlarmGroup: 3.12ms, [Client] Add client: 3.07ms, [MapImage] Add MapImage: 2.71ms, [Client] Remove client: 2.45ms, [MapImage] Move MapImage: 2.30ms, [Transfer] Toggle pause transfer: 1.84ms, [Hospital] Edit transportDuration to hospital: 1.79ms, [Vehicle] Rename vehicle: 1.69ms, [TransferPoint] Add TransferPoint: 1.30ms, [Viewport] Resize viewport: 1.06ms, [MapImage] Scale MapImage: 1.04ms, [Viewport] Move viewport: 0.83ms, [Client] Restrict to viewport: 0.78ms, [Hospital] Add hospital: 0.62ms, [Client] Set waitingroom: 0.62ms, [Viewport] Rename viewport: 0.54ms, [Viewport] Add viewport: 0.41ms, [Vehicle] Remove vehicle: 0.30ms, [MapImageTemplate] Edit mapImageTemplate: 0.30ms, [AlarmGroup] Remove AlarmGroupVehicle: 0.29ms, [AlarmGroup] Add AlarmGroup: 0.27ms, [Configuration] Set tileMapProperties: 0.11ms, [MapImageTemplate] Add mapImageTemplate: 0.08ms, [Configuration] Set bluePatientsEnabled: 0.08ms, [MapImage] Remove MapImage: 0.08ms, [Exercise] Start: 0.04ms, [AlarmGroup] Remove AlarmGroup: 0.04ms, [Exercise] Pause: 0.04ms
  numberOfActionsPerType: [Exercise] Tick: 2905, [AlarmGroup] Edit AlarmGroupVehicle: 1098, [Personnel] Move personnel: 274, [Vehicle] Move vehicle: 244, [Patient] Move patient: 218, [Hospital] Rename hospital: 203, [Material] Move material: 159, [Transfer] Edit transfer: 95, [Transfer] Add to transfer: 78, [AlarmGroup] Rename AlarmGroup: 64, [TransferPoint] Move TransferPoint: 59, [Client] Add client: 57, [AlarmGroup] Add AlarmGroupVehicle: 57, [TransferPoint] Rename TransferPoint: 55, [Vehicle] Add vehicle: 55, [Client] Remove client: 48, [TransferPoint] Connect hospital: 43, [Patient] Set Visible Status: 43, [Patient] Add patient: 41, [Vehicle] Load vehicle: 40, [TransferPoint] Connect TransferPoints: 38, [Hospital] Edit transportDuration to hospital: 36, [Vehicle] Unload vehicle: 29, [MapImage] Move MapImage: 28, [MapImage] Add MapImage: 27, [TransferPoint] Add TransferPoint: 20, [Viewport] Resize viewport: 19, [Hospital] Transport patient to hospital: 15, [Viewport] Move viewport: 14, [Transfer] Toggle pause transfer: 13, [Client] Restrict to viewport: 12, [Hospital] Add hospital: 12, [MapImage] Scale MapImage: 12, [Viewport] Rename viewport: 10, [Client] Set waitingroom: 10, [Vehicle] Rename vehicle: 9, [AlarmGroup] Add AlarmGroup: 6, [Viewport] Add viewport: 5, [MapImageTemplate] Edit mapImageTemplate: 5, [AlarmGroup] Remove AlarmGroupVehicle: 4, [Configuration] Set bluePatientsEnabled: 2, [Configuration] Set tileMapProperties: 1, [AlarmGroup] Remove AlarmGroup: 1, [MapImageTemplate] Add mapImageTemplate: 1, [MapImage] Remove MapImage: 1, [Exercise] Start: 1, [Vehicle] Remove vehicle: 1, [Exercise] Pause: 1

exercise-state-2022-07-27-workshop-malteser-großes-szenario.json
  migrate:                    820ms     741ms     748ms     740ms     734ms     746ms     851ms     793ms     738ms     747ms         Not deterministic!
  validateExercise:           1437ms    1380ms    1400ms    1545ms    1369ms    1350ms    1399ms    1392ms    1450ms    1317ms    
  newImmerDraft:              4288ms    4292ms    4348ms    4266ms    4238ms    4254ms    4293ms    4241ms    4243ms    4245ms        Not deterministic!
  sameImmerDraft:             599ms     594ms     604ms     610ms     594ms     604ms     597ms     596ms     607ms     603ms         Not deterministic!
  noImmerDraft:               58ms      55ms      56ms      55ms      57ms      55ms      56ms      55ms      57ms      54ms          Not deterministic!
  The endStates of the previous three steps are not equal!
  This most likely means that a reducer is either not deterministic or makes some assumptions about immer specific stuff (use of "original()").
  To further debug this, you should log the endStates of the respective exercises and can compare them directly in vscode via "Compare file with".
  benchmarkActions: [Exercise] Tick: 3888.56ms, [Patient] Move patient: 110.12ms, [Personnel] Move personnel: 74.68ms, [Transfer] Edit transfer: 47.81ms, [Material] Move material: 29.60ms, [Vehicle] Load vehicle: 16.38ms, [Vehicle] Unload vehicle: 14.15ms, [Patient] Set Visible Status: 13.65ms, [Vehicle] Move vehicle: 13.27ms, [Vehicle] Add vehicle: 11.37ms, [Hospital] Transport patient to hospital: 10.75ms, [Transfer] Add to transfer: 6.59ms, [TransferPoint] Connect hospital: 5.22ms, [Patient] Add patient: 2.87ms, [TransferPoint] Disconnect hospital: 1.97ms, [Emergency Operation Center] Add Log Entry: 1.37ms, [AlarmGroup] Edit AlarmGroupVehicle: 1.37ms, [MapImage] Scale MapImage: 1.33ms, [Patient] Remove patient: 1.31ms, [Client] Add client: 1.02ms, [Client] Remove client: 0.88ms, [TransferPoint] Move TransferPoint: 0.87ms, [Viewport] Resize viewport: 0.76ms, [Transfer] Toggle pause transfer: 0.72ms, [Vehicle] Remove vehicle: 0.62ms, [MapImage] Move MapImage: 0.61ms, [Client] Restrict to viewport: 0.55ms, [TransferPoint] Remove TransferPoint: 0.54ms, [Viewport] Move viewport: 0.39ms, [Client] Set waitingroom: 0.38ms, [MapImage] Add MapImage: 0.28ms, [TransferPoint] Connect TransferPoints: 0.19ms, [AlarmGroup] Remove AlarmGroupVehicle: 0.18ms, [Viewport] Add viewport: 0.17ms, [MapImage] Remove MapImage: 0.15ms, [Hospital] Rename hospital: 0.14ms, [Viewport] Remove viewport: 0.14ms, [Viewport] Rename viewport: 0.10ms, [TransferPoint] Disconnect TransferPoints: 0.09ms, [TransferPoint] Add TransferPoint: 0.07ms, [AlarmGroup] Add AlarmGroupVehicle: 0.07ms, [MapImage] Reconfigure Url: 0.04ms, [Exercise] Pause: 0.04ms, [Exercise] Start: 0.03ms
  numberOfActionsPerType: [Exercise] Tick: 3181, [Transfer] Edit transfer: 667, [Personnel] Move personnel: 159, [Vehicle] Move vehicle: 149, [Patient] Move patient: 134, [Material] Move material: 65, [Transfer] Add to transfer: 60, [TransferPoint] Connect hospital: 47, [Vehicle] Add vehicle: 43, [Patient] Set Visible Status: 35, [Vehicle] Load vehicle: 33, [Emergency Operation Center] Add Log Entry: 22, [AlarmGroup] Edit AlarmGroupVehicle: 20, [Client] Add client: 19, [TransferPoint] Disconnect hospital: 19, [Client] Remove client: 18, [Vehicle] Unload vehicle: 18, [Hospital] Transport patient to hospital: 17, [MapImage] Scale MapImage: 15, [Viewport] Resize viewport: 13, [TransferPoint] Move TransferPoint: 11, [Client] Restrict to viewport: 9, [Transfer] Toggle pause transfer: 8, [Client] Set waitingroom: 7, [Viewport] Move viewport: 7, [MapImage] Move MapImage: 7, [Patient] Add patient: 7, [Patient] Remove patient: 7, [AlarmGroup] Remove AlarmGroupVehicle: 3, [Viewport] Add viewport: 3, [Viewport] Remove viewport: 3, [Viewport] Rename viewport: 2, [TransferPoint] Connect TransferPoints: 2, [Hospital] Rename hospital: 2, [Vehicle] Remove vehicle: 2, [MapImage] Add MapImage: 2, [MapImage] Remove MapImage: 2, [AlarmGroup] Add AlarmGroupVehicle: 1, [Exercise] Start: 1, [Exercise] Pause: 1, [TransferPoint] Add TransferPoint: 1, [TransferPoint] Disconnect TransferPoints: 1, [TransferPoint] Remove TransferPoint: 1, [MapImage] Reconfigure Url: 1


┌──────────────────────────────────────────────────────────────────┬───────────┬─────────┬──────────────────┬───────────────┬────────────────┬──────────────┬───────────────────────────────┬──────────┐
│                             (index)                              │ fileSize  │ migrate │ validateExercise │ newImmerDraft │ sameImmerDraft │ noImmerDraft │      mostExpensiveAction      │ #actions │
├──────────────────────────────────────────────────────────────────┼───────────┼─────────┼──────────────────┼───────────────┼────────────────┼──────────────┼───────────────────────────────┼──────────┤
│              empty-state-version-14.permanent.json               │ '0.084MB' │  '6ms'  │      '20ms'      │     '0ms'     │     '0ms'      │    '1ms'     │ '[Client] Add client 100.00%' │    1     │
│            exercise-state-2022-05-31-small-demo.json             │  '2.3MB'  │ '106ms' │     '212ms'      │    '534ms'    │     '75ms'     │    '6ms'     │   '[Exercise] Tick 94.76%'    │   1208   │
│   exercise-state-2022-05-31-workshop-babz-großes-szenario.json   │  '19MB'   │ '710ms' │     '1652ms'     │   '5780ms'    │    '523ms'     │    '80ms'    │   '[Exercise] Tick 85.65%'    │   6169   │
│ exercise-state-2022-07-27-workshop-malteser-großes-szenario.json │  '16MB'   │ '766ms' │     '1404ms'     │   '4271ms'    │    '601ms'     │    '56ms'    │   '[Exercise] Tick 91.25%'    │   4825   │
└──────────────────────────────────────────────────────────────────┴───────────┴─────────┴──────────────────┴───────────────┴────────────────┴──────────────┴───────────────────────────────┴──────────┘

Mutative

empty-state-version-14.permanent.json
  migrate:                    7ms       3ms       3ms       2ms       4ms       3ms       4ms       4ms       5ms       1ms       
  validateExercise:           48ms      38ms      23ms      17ms      12ms      9ms       9ms       9ms       10ms      9ms       
  newImmerDraft:              0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms
  sameImmerDraft:             1ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms       
  noImmerDraft:               1ms       3ms       1ms       1ms       1ms       1ms       2ms       2ms       1ms       1ms
  benchmarkActions: [Client] Add client: 0.03ms
    The summed up time of all actions is 0.27 times the time of the direct benchmark ("newImmerDraft").
  numberOfActionsPerType: [Client] Add client: 1

exercise-state-2022-05-31-small-demo.json
  migrate:                    147ms     100ms     92ms      92ms      94ms      93ms      95ms      92ms      94ms      89ms      
  validateExercise:           238ms     224ms     197ms     211ms     210ms     212ms     248ms     192ms     193ms     196ms     
  newImmerDraft:              143ms     133ms     126ms     127ms     126ms     126ms     124ms     128ms     125ms     123ms     
  sameImmerDraft:             83ms      67ms      66ms      66ms      66ms      65ms      69ms      66ms      66ms      66ms      
  noImmerDraft:               7ms       7ms       6ms       6ms       5ms       7ms       7ms       6ms       7ms       5ms       
  benchmarkActions: [Exercise] Tick: 112.85ms, [Personnel] Move personnel: 3.74ms, [Patient] Move patient: 2.40ms, [Material] Move material: 1.02ms, [Vehicle] Unload vehicle: 0.92ms, [Patient] Set Visible Status: 0.42ms, [Vehicle] Add vehicle: 0.39ms, [Vehicle] Load vehicle: 0.28ms, [Hospital] Transport patient to hospital: 0.21ms, [Vehicle] Move vehicle: 0.17ms, [Transfer] Add to transfer: 0.14ms, [Client] Add client: 0.03ms, [Transfer] Edit transfer: 0.03ms, [Client] Restrict to viewport: 0.03ms, [Client] Set waitingroom: 0.02ms, [TransferPoint] Move TransferPoint: 0.02ms, [Client] Remove client: 0.02ms, [Exercise] Start: 0.01ms, [Exercise] Pause: 0.01ms
  numberOfActionsPerType: [Exercise] Tick: 1079, [Personnel] Move personnel: 29, [Patient] Move patient: 18, [Vehicle] Move vehicle: 15, [Patient] Set Visible Status: 11, [Transfer] Add to transfer: 10, [Material] Move material: 10, [Vehicle] Add vehicle: 9, [Vehicle] Unload vehicle: 5, [Client] Add client: 3, [Client] Restrict to viewport: 3, [Client] Set waitingroom: 3, [Transfer] Edit transfer: 3, [Client] Remove client: 2, [Exercise] Start: 2, [Exercise] Pause: 2, [TransferPoint] Move TransferPoint: 2, [Vehicle] Load vehicle: 1, [Hospital] Transport patient to hospital: 1

exercise-state-2022-05-31-workshop-babz-großes-szenario.json
  migrate:                    646ms     614ms     625ms     618ms     690ms     613ms     603ms     602ms     617ms     643ms     
  validateExercise:           1595ms    1618ms    1541ms    1523ms    1566ms    1490ms    1493ms    1500ms    1576ms    1583ms    
  newImmerDraft:              1497ms    1480ms    1462ms    1444ms    1453ms    1456ms    1462ms    1484ms    1463ms    1451ms    
  sameImmerDraft:             442ms     443ms     439ms     440ms     439ms     434ms     443ms     435ms     439ms     437ms     
  noImmerDraft:               79ms      76ms      76ms      76ms      76ms      76ms      78ms      78ms      77ms      84ms      
  benchmarkActions: [Exercise] Tick: 1182.54ms, [Patient] Move patient: 76.10ms, [Personnel] Move personnel: 54.31ms, [Material] Move material: 29.41ms, [Vehicle] Unload vehicle: 10.77ms, [AlarmGroup] Edit AlarmGroupVehicle: 10.71ms, [Vehicle] Load vehicle: 8.30ms, [Patient] Add patient: 6.31ms, [Patient] Set Visible Status: 4.33ms, [Vehicle] Move vehicle: 4.07ms, [Vehicle] Add vehicle: 3.81ms, [Hospital] Transport patient to hospital: 3.03ms, [Hospital] Rename hospital: 1.81ms, [Transfer] Add to transfer: 1.63ms, [Transfer] Edit transfer: 1.46ms, [MapImage] Add MapImage: 0.91ms, [TransferPoint] Move TransferPoint: 0.73ms, [AlarmGroup] Add AlarmGroupVehicle: 0.63ms, [TransferPoint] Connect hospital: 0.56ms, [Client] Add client: 0.54ms, [TransferPoint] Connect TransferPoints: 0.53ms, [AlarmGroup] Rename AlarmGroup: 0.49ms, [TransferPoint] Rename TransferPoint: 0.46ms, [Client] Remove client: 0.37ms, [Hospital] Edit transportDuration to hospital: 0.35ms, [MapImage] Move MapImage: 0.33ms, [Transfer] Toggle pause transfer: 0.28ms, [TransferPoint] Add TransferPoint: 0.27ms, [Vehicle] Rename vehicle: 0.27ms, [Viewport] Resize viewport: 0.25ms, [Viewport] Move viewport: 0.16ms, [Hospital] Add hospital: 0.14ms, [MapImage] Scale MapImage: 0.14ms, [Viewport] Rename viewport: 0.11ms, [Client] Restrict to viewport: 0.11ms, [Client] Set waitingroom: 0.08ms, [AlarmGroup] Add AlarmGroup: 0.07ms, [MapImageTemplate] Edit mapImageTemplate: 0.06ms, [Viewport] Add viewport: 0.06ms, [Vehicle] Remove vehicle: 0.04ms, [AlarmGroup] Remove AlarmGroupVehicle: 0.04ms, [MapImageTemplate] Add mapImageTemplate: 0.02ms, [Configuration] Set bluePatientsEnabled: 0.01ms, [MapImage] Remove MapImage: 0.01ms, [Configuration] Set tileMapProperties: 0.01ms, [AlarmGroup] Remove AlarmGroup: 0.01ms, [Exercise] Pause: 0.01ms, [Exercise] Start: 0.01ms
  numberOfActionsPerType: [Exercise] Tick: 2905, [AlarmGroup] Edit AlarmGroupVehicle: 1098, [Personnel] Move personnel: 274, [Vehicle] Move vehicle: 244, [Patient] Move patient: 218, [Hospital] Rename hospital: 203, [Material] Move material: 159, [Transfer] Edit transfer: 95, [Transfer] Add to transfer: 78, [AlarmGroup] Rename AlarmGroup: 64, [TransferPoint] Move TransferPoint: 59, [Client] Add client: 57, [AlarmGroup] Add AlarmGroupVehicle: 57, [TransferPoint] Rename TransferPoint: 55, [Vehicle] Add vehicle: 55, [Client] Remove client: 48, [TransferPoint] Connect hospital: 43, [Patient] Set Visible Status: 43, [Patient] Add patient: 41, [Vehicle] Load vehicle: 40, [TransferPoint] Connect TransferPoints: 38, [Hospital] Edit transportDuration to hospital: 36, [Vehicle] Unload vehicle: 29, [MapImage] Move MapImage: 28, [MapImage] Add MapImage: 27, [TransferPoint] Add TransferPoint: 20, [Viewport] Resize viewport: 19, [Hospital] Transport patient to hospital: 15, [Viewport] Move viewport: 14, [Transfer] Toggle pause transfer: 13, [Client] Restrict to viewport: 12, [Hospital] Add hospital: 12, [MapImage] Scale MapImage: 12, [Viewport] Rename viewport: 10, [Client] Set waitingroom: 10, [Vehicle] Rename vehicle: 9, [AlarmGroup] Add AlarmGroup: 6, [Viewport] Add viewport: 5, [MapImageTemplate] Edit mapImageTemplate: 5, [AlarmGroup] Remove AlarmGroupVehicle: 4, [Configuration] Set bluePatientsEnabled: 2, [Configuration] Set tileMapProperties: 1, [AlarmGroup] Remove AlarmGroup: 1, [MapImageTemplate] Add mapImageTemplate: 1, [MapImage] Remove MapImage: 1, [Exercise] Start: 1, [Vehicle] Remove vehicle: 1, [Exercise] Pause: 1

exercise-state-2022-07-27-workshop-malteser-großes-szenario.json
  migrate:                    689ms     665ms     668ms     671ms     674ms     672ms     662ms     665ms     661ms     685ms         Not deterministic!
  validateExercise:           1367ms    1395ms    1301ms    1303ms    1315ms    1320ms    1327ms    1397ms    1331ms    1324ms    
  newImmerDraft:              1063ms    1045ms    1051ms    1051ms    1049ms    1049ms    1048ms    1051ms    1046ms    1047ms        Not deterministic!
  sameImmerDraft:             522ms     519ms     518ms     518ms     544ms     519ms     527ms     518ms     520ms     518ms         Not deterministic!
  noImmerDraft:               57ms      55ms      56ms      55ms      56ms      56ms      56ms      55ms      57ms      56ms          Not deterministic!
  The endStates of the previous three steps are not equal!
  This most likely means that a reducer is either not deterministic or makes some assumptions about immer specific stuff (use of "original()").
  To further debug this, you should log the endStates of the respective exercises and can compare them directly in vscode via "Compare file with".
  benchmarkActions: [Exercise] Tick: 905.00ms, [Patient] Move patient: 41.11ms, [Personnel] Move personnel: 24.49ms, [Material] Move material: 9.82ms, [Transfer] Edit transfer: 6.42ms, [Vehicle] Unload vehicle: 5.39ms, [Vehicle] Load vehicle: 5.05ms, [Patient] Set Visible Status: 4.06ms, [Hospital] Transport patient to hospital: 3.85ms, [Vehicle] Add vehicle: 2.59ms, [Vehicle] Move vehicle: 2.15ms, [Transfer] Add to transfer: 1.02ms, [Patient] Add patient: 1.02ms, [TransferPoint] Connect hospital: 0.60ms, [Patient] Remove patient: 0.47ms, [Emergency Operation Center] Add Log Entry: 0.42ms, [TransferPoint] Disconnect hospital: 0.33ms, [TransferPoint] Remove TransferPoint: 0.25ms, [Client] Add client: 0.21ms, [AlarmGroup] Edit AlarmGroupVehicle: 0.20ms, [MapImage] Scale MapImage: 0.19ms, [Client] Remove client: 0.18ms, [Viewport] Resize viewport: 0.16ms, [TransferPoint] Move TransferPoint: 0.13ms, [MapImage] Add MapImage: 0.11ms, [Transfer] Toggle pause transfer: 0.10ms, [MapImage] Move MapImage: 0.10ms, [Client] Restrict to viewport: 0.09ms, [Vehicle] Remove vehicle: 0.08ms, [Viewport] Move viewport: 0.07ms, [Client] Set waitingroom: 0.06ms, [Viewport] Add viewport: 0.04ms, [TransferPoint] Connect TransferPoints: 0.04ms, [AlarmGroup] Remove AlarmGroupVehicle: 0.03ms, [Viewport] Remove viewport: 0.02ms, [MapImage] Remove MapImage: 0.02ms, [Hospital] Rename hospital: 0.02ms, [TransferPoint] Add TransferPoint: 0.02ms, [Viewport] Rename viewport: 0.02ms, [TransferPoint] Disconnect TransferPoints: 0.01ms, [AlarmGroup] Add AlarmGroupVehicle: 0.01ms, [MapImage] Reconfigure Url: 0.01ms, [Exercise] Pause: 0.01ms, [Exercise] Start: 0.01ms
  numberOfActionsPerType: [Exercise] Tick: 3181, [Transfer] Edit transfer: 667, [Personnel] Move personnel: 159, [Vehicle] Move vehicle: 149, [Patient] Move patient: 134, [Material] Move material: 65, [Transfer] Add to transfer: 60, [TransferPoint] Connect hospital: 47, [Vehicle] Add vehicle: 43, [Patient] Set Visible Status: 35, [Vehicle] Load vehicle: 33, [Emergency Operation Center] Add Log Entry: 22, [AlarmGroup] Edit AlarmGroupVehicle: 20, [Client] Add client: 19, [TransferPoint] Disconnect hospital: 19, [Client] Remove client: 18, [Vehicle] Unload vehicle: 18, [Hospital] Transport patient to hospital: 17, [MapImage] Scale MapImage: 15, [Viewport] Resize viewport: 13, [TransferPoint] Move TransferPoint: 11, [Client] Restrict to viewport: 9, [Transfer] Toggle pause transfer: 8, [Client] Set waitingroom: 7, [Viewport] Move viewport: 7, [MapImage] Move MapImage: 7, [Patient] Add patient: 7, [Patient] Remove patient: 7, [AlarmGroup] Remove AlarmGroupVehicle: 3, [Viewport] Add viewport: 3, [Viewport] Remove viewport: 3, [Viewport] Rename viewport: 2, [TransferPoint] Connect TransferPoints: 2, [Hospital] Rename hospital: 2, [Vehicle] Remove vehicle: 2, [MapImage] Add MapImage: 2, [MapImage] Remove MapImage: 2, [AlarmGroup] Add AlarmGroupVehicle: 1, [Exercise] Start: 1, [Exercise] Pause: 1, [TransferPoint] Add TransferPoint: 1, [TransferPoint] Disconnect TransferPoints: 1, [TransferPoint] Remove TransferPoint: 1, [MapImage] Reconfigure Url: 1


┌──────────────────────────────────────────────────────────────────┬───────────┬─────────┬──────────────────┬───────────────┬────────────────┬──────────────┬───────────────────────────────┬──────────┐
│                             (index)                              │ fileSize  │ migrate │ validateExercise │ newImmerDraft │ sameImmerDraft │ noImmerDraft │      mostExpensiveAction      │ #actions │
├──────────────────────────────────────────────────────────────────┼───────────┼─────────┼──────────────────┼───────────────┼────────────────┼──────────────┼───────────────────────────────┼──────────┤
│              empty-state-version-14.permanent.json               │ '0.084MB' │  '4ms'  │      '18ms'      │     '0ms'     │     '0ms'      │    '1ms'     │ '[Client] Add client 100.00%' │    1     │
│            exercise-state-2022-05-31-small-demo.json             │  '2.3MB'  │ '99ms'  │     '212ms'      │    '128ms'    │     '68ms'     │    '6ms'     │   '[Exercise] Tick 91.97%'    │   1208   │
│   exercise-state-2022-05-31-workshop-babz-großes-szenario.json   │  '19MB'   │ '627ms' │     '1549ms'     │   '1465ms'    │    '439ms'     │    '78ms'    │   '[Exercise] Tick 84.07%'    │   6169   │
│ exercise-state-2022-07-27-workshop-malteser-großes-szenario.json │  '16MB'   │ '671ms' │     '1338ms'     │   '1050ms'    │    '522ms'     │    '56ms'    │   '[Exercise] Tick 89.08%'    │   4825   │
└──────────────────────────────────────────────────────────────────┴───────────┴─────────┴──────────────────┴───────────────┴────────────────┴──────────────┴───────────────────────────────┴──────────┘

Mutative without `autoFreeze`

empty-state-version-14.permanent.json
  migrate:                    7ms       3ms       2ms       2ms       4ms       3ms       2ms       6ms       1ms       1ms       
  validateExercise:           54ms      37ms      30ms      20ms      10ms      10ms      10ms      10ms      9ms       9ms       
  newImmerDraft:              0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms       
  sameImmerDraft:             0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms       0ms
  noImmerDraft:               1ms       2ms       1ms       1ms       1ms       1ms       1ms       1ms       1ms       1ms
  benchmarkActions: [Client] Add client: 0.02ms
    The summed up time of all actions is 0.23 times the time of the direct benchmark ("newImmerDraft").
  numberOfActionsPerType: [Client] Add client: 1

exercise-state-2022-05-31-small-demo.json
  migrate:                    137ms     102ms     93ms      94ms      92ms      92ms      89ms      94ms      94ms      92ms      
  validateExercise:           261ms     200ms     199ms     198ms     224ms     192ms     198ms     200ms     200ms     202ms     
  newImmerDraft:              151ms     133ms     129ms     128ms     150ms     129ms     127ms     126ms     129ms     135ms     
  sameImmerDraft:             68ms      66ms      67ms      66ms      68ms      67ms      68ms      69ms      69ms      78ms      
  noImmerDraft:               7ms       7ms       7ms       7ms       5ms       7ms       8ms       10ms      7ms       6ms       
  benchmarkActions: [Exercise] Tick: 105.09ms, [Personnel] Move personnel: 3.62ms, [Patient] Move patient: 2.30ms, [Material] Move material: 0.90ms, [Vehicle] Unload vehicle: 0.87ms, [Patient] Set Visible Status: 0.40ms, [Vehicle] Add vehicle: 0.39ms, [Vehicle] Load vehicle: 0.26ms, [Hospital] Transport patient to hospital: 0.20ms, [Vehicle] Move vehicle: 0.15ms, [Transfer] Add to transfer: 0.14ms, [Transfer] Edit transfer: 0.03ms, [Client] Add client: 0.03ms, [Client] Restrict to viewport: 0.02ms, [Client] Set waitingroom: 0.02ms, [TransferPoint] Move TransferPoint: 0.02ms, [Client] Remove client: 0.02ms, [Exercise] Pause: 0.01ms, [Exercise] Start: 0.01ms
    The summed up time of all actions is 0.86 times the time of the direct benchmark ("newImmerDraft").
  numberOfActionsPerType: [Exercise] Tick: 1079, [Personnel] Move personnel: 29, [Patient] Move patient: 18, [Vehicle] Move vehicle: 15, [Patient] Set Visible Status: 11, [Transfer] Add to transfer: 10, [Material] Move material: 10, [Vehicle] Add vehicle: 9, [Vehicle] Unload vehicle: 5, [Client] Add client: 3, [Client] Restrict to viewport: 3, [Client] Set waitingroom: 3, [Transfer] Edit transfer: 3, [Client] Remove client: 2, [Exercise] Start: 2, [Exercise] Pause: 2, [TransferPoint] Move TransferPoint: 2, [Vehicle] Load vehicle: 1, [Hospital] Transport patient to hospital: 1

exercise-state-2022-05-31-workshop-babz-großes-szenario.json
  migrate:                    704ms     627ms     631ms     618ms     617ms     619ms     616ms     614ms     626ms     611ms     
  validateExercise:           1531ms    1524ms    1586ms    1491ms    1520ms    1518ms    1513ms    1575ms    1494ms    1528ms    
  newImmerDraft:              1534ms    1498ms    1495ms    1476ms    1479ms    1497ms    1472ms    1474ms    1472ms    1472ms    
  sameImmerDraft:             447ms     451ms     452ms     445ms     454ms     444ms     446ms     443ms     445ms     443ms     
  noImmerDraft:               80ms      80ms      79ms      81ms      81ms      79ms      79ms      80ms      79ms      79ms      
  benchmarkActions: [Exercise] Tick: 1118.59ms, [Patient] Move patient: 72.26ms, [Personnel] Move personnel: 50.55ms, [Material] Move material: 27.41ms, [Vehicle] Unload vehicle: 10.36ms, [AlarmGroup] Edit AlarmGroupVehicle: 7.98ms, [Vehicle] Load vehicle: 7.70ms, [Patient] Add patient: 6.37ms, [Patient] Set Visible Status: 3.98ms, [Vehicle] Move vehicle: 3.53ms, [Vehicle] Add vehicle: 3.08ms, [Hospital] Transport patient to hospital: 2.72ms, [Hospital] Rename hospital: 1.47ms, [Transfer] Add to transfer: 1.28ms, [Transfer] Edit transfer: 1.23ms, [MapImage] Add MapImage: 0.84ms, [TransferPoint] Move TransferPoint: 0.70ms, [AlarmGroup] Add AlarmGroupVehicle: 0.47ms, [TransferPoint] Connect hospital: 0.46ms, [AlarmGroup] Rename AlarmGroup: 0.43ms, [Client] Add client: 0.41ms, [TransferPoint] Connect TransferPoints: 0.41ms, [Viewport] Resize viewport: 0.34ms, [TransferPoint] Rename TransferPoint: 0.33ms, [TransferPoint] Add TransferPoint: 0.30ms, [Client] Remove client: 0.29ms, [Hospital] Edit transportDuration to hospital: 0.26ms, [MapImage] Move MapImage: 0.25ms, [Vehicle] Rename vehicle: 0.24ms, [Hospital] Add hospital: 0.22ms, [Transfer] Toggle pause transfer: 0.17ms, [Viewport] Move viewport: 0.15ms, [Viewport] Rename viewport: 0.10ms, [MapImage] Scale MapImage: 0.10ms, [Client] Restrict to viewport: 0.08ms, [Client] Set waitingroom: 0.06ms, [AlarmGroup] Add AlarmGroup: 0.05ms, [MapImageTemplate] Edit mapImageTemplate: 0.05ms, [Viewport] Add viewport: 0.05ms, [Vehicle] Remove vehicle: 0.03ms, [AlarmGroup] Remove AlarmGroupVehicle: 0.03ms, [MapImageTemplate] Add mapImageTemplate: 0.02ms, [Configuration] Set bluePatientsEnabled: 0.01ms, [MapImage] Remove MapImage: 0.01ms, [Exercise] Pause: 0.01ms, [Configuration] Set tileMapProperties: 0.01ms, [AlarmGroup] Remove AlarmGroup: 0.01ms, [Exercise] Start: 0.00ms
    The summed up time of all actions is 0.89 times the time of the direct benchmark ("newImmerDraft").
  numberOfActionsPerType: [Exercise] Tick: 2905, [AlarmGroup] Edit AlarmGroupVehicle: 1098, [Personnel] Move personnel: 274, [Vehicle] Move vehicle: 244, [Patient] Move patient: 218, [Hospital] Rename hospital: 203, [Material] Move material: 159, [Transfer] Edit transfer: 95, [Transfer] Add to transfer: 78, [AlarmGroup] Rename AlarmGroup: 64, [TransferPoint] Move TransferPoint: 59, [Client] Add client: 57, [AlarmGroup] Add AlarmGroupVehicle: 57, [TransferPoint] Rename TransferPoint: 55, [Vehicle] Add vehicle: 55, [Client] Remove client: 48, [TransferPoint] Connect hospital: 43, [Patient] Set Visible Status: 43, [Patient] Add patient: 41, [Vehicle] Load vehicle: 40, [TransferPoint] Connect TransferPoints: 38, [Hospital] Edit transportDuration to hospital: 36, [Vehicle] Unload vehicle: 29, [MapImage] Move MapImage: 28, [MapImage] Add MapImage: 27, [TransferPoint] Add TransferPoint: 20, [Viewport] Resize viewport: 19, [Hospital] Transport patient to hospital: 15, [Viewport] Move viewport: 14, [Transfer] Toggle pause transfer: 13, [Client] Restrict to viewport: 12, [Hospital] Add hospital: 12, [MapImage] Scale MapImage: 12, [Viewport] Rename viewport: 10, [Client] Set waitingroom: 10, [Vehicle] Rename vehicle: 9, [AlarmGroup] Add AlarmGroup: 6, [Viewport] Add viewport: 5, [MapImageTemplate] Edit mapImageTemplate: 5, [AlarmGroup] Remove AlarmGroupVehicle: 4, [Configuration] Set bluePatientsEnabled: 2, [Configuration] Set tileMapProperties: 1, [AlarmGroup] Remove AlarmGroup: 1, [MapImageTemplate] Add mapImageTemplate: 1, [MapImage] Remove MapImage: 1, [Exercise] Start: 1, [Vehicle] Remove vehicle: 1, [Exercise] Pause: 1

exercise-state-2022-07-27-workshop-malteser-großes-szenario.json
  migrate:                    694ms     679ms     698ms     674ms     676ms     672ms     687ms     768ms     690ms     685ms         Not deterministic!
  validateExercise:           1295ms    1303ms    1312ms    1391ms    1290ms    1294ms    1326ms    1323ms    1332ms    1365ms    
  newImmerDraft:              1082ms    1056ms    1065ms    1076ms    1056ms    1054ms    1068ms    1054ms    1055ms    1059ms        Not deterministic!
  sameImmerDraft:             522ms     538ms     528ms     521ms     522ms     521ms     522ms     521ms     528ms     525ms         Not deterministic!
  noImmerDraft:               56ms      56ms      56ms      55ms      57ms      55ms      56ms      56ms      56ms      56ms          Not deterministic!
  The endStates of the previous three steps are not equal!
  This most likely means that a reducer is either not deterministic or makes some assumptions about immer specific stuff (use of "original()").
  To further debug this, you should log the endStates of the respective exercises and can compare them directly in vscode via "Compare file with".
  benchmarkActions: [Exercise] Tick: 853.14ms, [Patient] Move patient: 39.11ms, [Personnel] Move personnel: 23.02ms, [Material] Move material: 9.25ms, [Vehicle] Unload vehicle: 5.17ms, [Transfer] Edit transfer: 5.14ms, [Vehicle] Load vehicle: 4.64ms, [Patient] Set Visible Status: 3.73ms, [Hospital] Transport patient to hospital: 3.57ms, [Vehicle] Add vehicle: 2.13ms, [Vehicle] Move vehicle: 1.87ms, [Transfer] Add to transfer: 0.91ms, [Patient] Add patient: 0.90ms, [TransferPoint] Connect hospital: 0.51ms, [Patient] Remove patient: 0.43ms, [Emergency Operation Center] Add Log Entry: 0.34ms, [TransferPoint] Remove TransferPoint: 0.24ms, [AlarmGroup] Edit AlarmGroupVehicle: 0.23ms, [TransferPoint] Disconnect hospital: 0.19ms, [Client] Add client: 0.19ms, [TransferPoint] Move TransferPoint: 0.18ms, [Client] Remove client: 0.18ms, [MapImage] Scale MapImage: 0.16ms, [Transfer] Toggle pause transfer: 0.16ms, [Viewport] Resize viewport: 0.14ms, [MapImage] Add MapImage: 0.10ms, [Client] Restrict to viewport: 0.08ms, [MapImage] Move MapImage: 0.08ms, [Viewport] Move viewport: 0.06ms, [Vehicle] Remove vehicle: 0.06ms, [Client] Set waitingroom: 0.05ms, [Viewport] Add viewport: 0.03ms, [TransferPoint] Connect TransferPoints: 0.03ms, [AlarmGroup] Remove AlarmGroupVehicle: 0.02ms, [Viewport] Remove viewport: 0.02ms, [MapImage] Remove MapImage: 0.01ms, [Hospital] Rename hospital: 0.01ms, [TransferPoint] Add TransferPoint: 0.01ms, [Viewport] Rename viewport: 0.01ms, [TransferPoint] Disconnect TransferPoints: 0.01ms, [AlarmGroup] Add AlarmGroupVehicle: 0.01ms, [MapImage] Reconfigure Url: 0.01ms, [Exercise] Pause: 0.01ms, [Exercise] Start: 0.00ms
    The summed up time of all actions is 0.90 times the time of the direct benchmark ("newImmerDraft").
  numberOfActionsPerType: [Exercise] Tick: 3181, [Transfer] Edit transfer: 667, [Personnel] Move personnel: 159, [Vehicle] Move vehicle: 149, [Patient] Move patient: 134, [Material] Move material: 65, [Transfer] Add to transfer: 60, [TransferPoint] Connect hospital: 47, [Vehicle] Add vehicle: 43, [Patient] Set Visible Status: 35, [Vehicle] Load vehicle: 33, [Emergency Operation Center] Add Log Entry: 22, [AlarmGroup] Edit AlarmGroupVehicle: 20, [Client] Add client: 19, [TransferPoint] Disconnect hospital: 19, [Client] Remove client: 18, [Vehicle] Unload vehicle: 18, [Hospital] Transport patient to hospital: 17, [MapImage] Scale MapImage: 15, [Viewport] Resize viewport: 13, [TransferPoint] Move TransferPoint: 11, [Client] Restrict to viewport: 9, [Transfer] Toggle pause transfer: 8, [Client] Set waitingroom: 7, [Viewport] Move viewport: 7, [MapImage] Move MapImage: 7, [Patient] Add patient: 7, [Patient] Remove patient: 7, [AlarmGroup] Remove AlarmGroupVehicle: 3, [Viewport] Add viewport: 3, [Viewport] Remove viewport: 3, [Viewport] Rename viewport: 2, [TransferPoint] Connect TransferPoints: 2, [Hospital] Rename hospital: 2, [Vehicle] Remove vehicle: 2, [MapImage] Add MapImage: 2, [MapImage] Remove MapImage: 2, [AlarmGroup] Add AlarmGroupVehicle: 1, [Exercise] Start: 1, [Exercise] Pause: 1, [TransferPoint] Add TransferPoint: 1, [TransferPoint] Disconnect TransferPoints: 1, [TransferPoint] Remove TransferPoint: 1, [MapImage] Reconfigure Url: 1


┌──────────────────────────────────────────────────────────────────┬───────────┬─────────┬──────────────────┬───────────────┬────────────────┬──────────────┬───────────────────────────────┬──────────┐
│                             (index)                              │ fileSize  │ migrate │ validateExercise │ newImmerDraft │ sameImmerDraft │ noImmerDraft │      mostExpensiveAction      │ #actions │
├──────────────────────────────────────────────────────────────────┼───────────┼─────────┼──────────────────┼───────────────┼────────────────┼──────────────┼───────────────────────────────┼──────────┤
│              empty-state-version-14.permanent.json               │ '0.084MB' │  '3ms'  │      '20ms'      │     '0ms'     │     '0ms'      │    '1ms'     │ '[Client] Add client 100.00%' │    1     │
│            exercise-state-2022-05-31-small-demo.json             │  '2.3MB'  │ '98ms'  │     '207ms'      │    '134ms'    │     '69ms'     │    '7ms'     │   '[Exercise] Tick 91.80%'    │   1208   │
│   exercise-state-2022-05-31-workshop-babz-großes-szenario.json   │  '19MB'   │ '628ms' │     '1528ms'     │   '1487ms'    │    '447ms'     │    '79ms'    │   '[Exercise] Tick 84.40%'    │   6169   │
│ exercise-state-2022-07-27-workshop-malteser-großes-szenario.json │  '16MB'   │ '692ms' │     '1323ms'     │   '1063ms'    │    '525ms'     │    '56ms'    │   '[Exercise] Tick 89.23%'    │   4825   │
└──────────────────────────────────────────────────────────────────┴───────────┴─────────┴──────────────────┴───────────────┴────────────────┴──────────────┴───────────────────────────────┴──────────┘

Summary

• The errors/warnings in the benchmarks are caused by AddLogEntryAction is not deterministic #580. The migrations are allowed to not be deterministic.
• Every action and state was deep frozen before being passed to the produce/create function. Immer.js basically has to be used with autoFreeze as it uses this as an internal flag to determine wether something can be shallow copied or must be deep copied (big perfromance drop when disabling it).
• These tested states had <50 patients/vehicles/personnel. It could be that the results for more extreme cases is different.

The accumulated time for each action per type of action is shown in the tables below.

workshop-babz-großes-szenario

Category	immerjs in ms	mutative in ms	mutative no freeze in ms
[Exercise] Tick	4992.40	1182.54	1118.59
[Patient] Move patient	215.10	76.10	72.26
[Personnel] Move personnel	177.14	54.31	50.55
[Transfer] Edit transfer	12.10	1.46	1.23
[Material] Move material	93.12	29.41	27.41

workshop-malteser-großes-szenario

Category	immerjs in ms	mutative in ms	mutative no freeze in ms
[Exercise] Tick	3888.56	905.00	853.14
[Patient] Move patient	110.12	41.11	39.11
[Personnel] Move personnel	74.68	24.49	23.02
[Transfer] Edit transfer	47.81	6.42	5.14
[Material] Move material	29.60	9.82	9.25

The [Exercise] Tick-action changes in every patient at least one property (health). In contrast, all other actions change only one property of one patient/personnel/material and potentially some stuff in the R-Trees.

Total accumulated time to process all actions

For runtime performance (on the server and client) the newImmerDraft-benchmark is relevant.
The noImmerDraft-benchmark is the baseline, without any overhead for mutability. It is impossible for the newImmerDraft-benchmark to be faster than the noImmerDraft-benchmark.

exercise	immerjs in ms	mutative in ms	mutative no freeze in ms	noImmerDraft in ms
small-demo	534	128	134	6
workshop-babz-großes-szenario	5780	1465	1487	80
workshop-malteser-großes-szenario	4271	1050	1063	56

AutoFreeze

Disabling autoFreeze reduced the time for each action slightly. Though, the total accumulated time increased slightly. This is very strange.

The time needed to freeze every action and the state after receiving it via the WebSocket was not included in this benchmark. In addition, it could be that V8 has (or will have) optimizations for frozen objects (saving memory, heuristics, ...), which would only be relevant when accessing the properties in the actual application on the frontend.

Conclusion

One can see that mutative is always between 3 to 4 times faster than immer.js.
This is basically free performance.

Still, I would recommend using immer.js for now as it is more mature, and we don't need the performance yet.
In addition, mutative could also probably prevent #531 (if this should ever be desired).
immer.js also has some performance improvements in the making immerjs/immer#1015, immerjs/immer#941.

[unadlib]

hi @Dassderdie , thanks for your attention to Mutative. Currently, Mutative has released its latest version 1.0.11.