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Bug: performance deteriorates when using ReactDOM.createRoot instead of ReactDom.render for virtual-table.

facebook/react#27524·250633·JavaScript·887 天未动·3 条评论·上游最近活跃 ·池内状态:可认领
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上游 issue 正文

While experimenting with react-window, I encountered a performance disparity in my project compared to the smooth user experience demonstrated in the react-window documentation examples. Even after building for production, I noticed white flashes when scrolling quickly in my project, whereas the documentation's examples remained consistently smooth. After conducting several experiments, I successfully identified the root cause: the performance significantly deteriorates when using ReactDOM.createRoot compared to the now deprecated ReactDOM.render. Here is a video to illustrate the issue: https://github.com/facebook/react/assets/7544804/0be9ba6f-47e8-4d61-bb6c-e8fef0787776 This issue is not exclusive to react-window; in fact, I first encountered it while developing a toy version of it using function components and hooks (react-window itself is currently implemented using class components). React version: Tried with react/react-dom 18.2.0 and react/react-dom 18.3.0-canary-09fbee89d-20231013 Link to code example: Here are two CodeSandbox examples of the same scenario with only one distinction: - The first one uses ReactDOM.render: https://codesandbox.io/s/modest-cdn-4jwd6y?file=/index.js - The second one uses ReactDOM.createRoot: https://codesandbox.io/s/magical-cdn-ggyytv?file=/index.js **It's worth noting that the issue seems to become more pronounced after building the React app for production.** I'm not sure if that's possible directly on codesandbox. Additionally, I've created two CodeSandbox using my own simplified version of a virtual table, the performance issue is also noticeable in this scenario: - Using ReactDom.render: https://codesandbox.io/s/sleepy-bardeen-43dd9g?file=/index.js - Using ReactDom.createRoot: https://codesandbox.io/s/friendly-wilson-qxs4yc?file=/index.js ## The current behavior The performance appears to be worse when using ReactDom.createRoot compared to ReactDom.render ## The expected behavior Using ReactDom.createRoot should give the sa…
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