React's document said that
We do not recommend doing deep equality checks or using JSON.stringify() in shouldComponentUpdate(). It is very inefficient and will harm performance. https://reactjs.org/docs/react-component.html#shouldcomponentupdate
- Performance issue (crash) in large apps when using Field with children in React v16 · Issue #3461 · erikras/redux-form
- Document that deep equality checks and JSON.stringify() in shouldComponentUpdate() are a bad idea · Issue #7 · reactjs/reactjs.org
Environment:
- MacBookPro14,1
- CPU: Intel Core i7, 2.5 GHz
- Browser: Chrome – 6x CPU throttling
Deep Equal (JSON.stringify(prevProps) === JSON.stringify(nextProps)):
Name: ⚛ A.shouldComponentUpdate, Duration: 0.9350000000004002
App.tsx:27 Name: ⚛ B.shouldComponentUpdate, Duration: 0.010000000000218279
App.tsx:27 Name: ⚛ C.shouldComponentUpdate, Duration: 1.1300000000001091
App.tsx:27 Name: ⚛ D.shouldComponentUpdate, Duration: 0.015000000000327418
App.tsx:27 Name: ⚛ E.shouldComponentUpdate, Duration: 0.009999999999308784
App.tsx:27 Name: ⚛ List.shouldComponentUpdate, Duration: 5.364999999999782
App.tsx:32 Total shouldComponentUpdate: 7.4650000000001455
App.tsx:33 Update components: ⚛ A.shouldComponentUpdate, ⚛ B.shouldComponentUpdate, ⚛ C.shouldComponentUpdate, ⚛ D.shouldComponentUpdate, ⚛ E.shouldComponentUpdate, ⚛ List.shouldComponentUpdate
App.tsx:27 Name: ⚛ A.shouldComponentUpdate, Duration: 0.014999999999417923
App.tsx:27 Name: ⚛ B.shouldComponentUpdate, Duration: 0.004999999999199645
App.tsx:27 Name: ⚛ C.shouldComponentUpdate, Duration: 0.019999999999527063
App.tsx:27 Name: ⚛ D.shouldComponentUpdate, Duration: 0.005000000000109139
App.tsx:27 Name: ⚛ E.shouldComponentUpdate, Duration: 0
App.tsx:27 Name: ⚛ List.shouldComponentUpdate, Duration: 5.770000000000437
App.tsx:32 Total shouldComponentUpdate: 5.81499999999869
App.tsx:33 Update components: ⚛ A.shouldComponentUpdate, ⚛ B.shouldComponentUpdate, ⚛ C.shouldComponentUpdate, ⚛ D.shouldComponentUpdate, ⚛ E.shouldComponentUpdate, ⚛ List.shouldComponentUpdate
App.tsx:27 Name: ⚛ A.shouldComponentUpdate, Duration: 0.015000000000327418
App.tsx:27 Name: ⚛ B.shouldComponentUpdate, Duration: 0.005000000000109139
App.tsx:27 Name: ⚛ C.shouldComponentUpdate, Duration: 0.005000000000109139
App.tsx:27 Name: ⚛ D.shouldComponentUpdate, Duration: 0.005000000000109139
App.tsx:27 Name: ⚛ E.shouldComponentUpdate, Duration: 0.005000000001018634
App.tsx:27 Name: ⚛ List.shouldComponentUpdate, Duration: 5.154999999999745
App.tsx:32 Total shouldComponentUpdate: 5.190000000001419
App.tsx:33 Update components: ⚛ A.shouldComponentUpdate, ⚛ B.shouldComponentUpdate, ⚛ C.shouldComponentUpdate, ⚛ D.shouldComponentUpdate, ⚛ E.shouldComponentUpdate, ⚛ List.shouldComponentUpdate
Shallow Equal(Use shallow-equal-props)
Name: ⚛ A.shouldComponentUpdate, Duration: 0.13999999999941792
App.tsx:27 Name: ⚛ B.shouldComponentUpdate, Duration: 0.010000000001127773
App.tsx:27 Name: ⚛ C.shouldComponentUpdate, Duration: 0.004999999999199645
App.tsx:27 Name: ⚛ D.shouldComponentUpdate, Duration: 0.010000000000218279
App.tsx:27 Name: ⚛ E.shouldComponentUpdate, Duration: 0.015000000000327418
App.tsx:27 Name: ⚛ List.shouldComponentUpdate, Duration: 1.125
App.tsx:32 Total shouldComponentUpdate: 1.305000000000291
App.tsx:33 Updated components: ⚛ A.shouldComponentUpdate, ⚛ B.shouldComponentUpdate, ⚛ C.shouldComponentUpdate, ⚛ D.shouldComponentUpdate, ⚛ E.shouldComponentUpdate, ⚛ List.shouldComponentUpdate
App.tsx:27 Name: ⚛ A.shouldComponentUpdate, Duration: 0.009999999999308784
App.tsx:27 Name: ⚛ B.shouldComponentUpdate, Duration: 0.005000000000109139
App.tsx:27 Name: ⚛ C.shouldComponentUpdate, Duration: 0.005000000000109139
App.tsx:27 Name: ⚛ D.shouldComponentUpdate, Duration: 0.004999999999199645
App.tsx:27 Name: ⚛ E.shouldComponentUpdate, Duration: 0.005000000000109139
App.tsx:27 Name: ⚛ List.shouldComponentUpdate, Duration: 0.009999999999308784
App.tsx:32 Total shouldComponentUpdate: 0.03999999999814463
App.tsx:33 Updated components: ⚛ A.shouldComponentUpdate, ⚛ B.shouldComponentUpdate, ⚛ C.shouldComponentUpdate, ⚛ D.shouldComponentUpdate, ⚛ E.shouldComponentUpdate, ⚛ List.shouldComponentUpdate
App.tsx:27 Name: ⚛ A.shouldComponentUpdate, Duration: 0.010000000000218279
App.tsx:27 Name: ⚛ B.shouldComponentUpdate, Duration: 0.004999999999199645
App.tsx:27 Name: ⚛ C.shouldComponentUpdate, Duration: 0
App.tsx:27 Name: ⚛ D.shouldComponentUpdate, Duration: 0.004999999999199645
App.tsx:27 Name: ⚛ E.shouldComponentUpdate, Duration: 0.005000000000109139
App.tsx:27 Name: ⚛ List.shouldComponentUpdate, Duration: 0.005000000000109139
App.tsx:32 Total shouldComponentUpdate: 0.029999999998835847
App.tsx:33 Updated components: ⚛ A.shouldComponentUpdate, ⚛ B.shouldComponentUpdate, ⚛ C.shouldComponentUpdate, ⚛ D.shouldComponentUpdate, ⚛ E.shouldComponentUpdate, ⚛ List.shouldComponentUpdate