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[React 19] `use` is significantly slower in some scenarios than throwing a Promise

facebook/react#29855·250633·JavaScript·58 天未动·27 条评论·上游最近活跃 ·池内状态:可认领
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## Summary This is something I noticed when I applied the Apollo Client test suite to React 19 - we had one test that was timing out. I first thought that the test was broken, but it turns out it was just really slow. Cranking the test that finished in React 18 in under 200 milliseconds to a timeout of 10 **seconds** for React 19 made it pass (6 seconds would still consistently fail, 7 seconds started to pass on localhost). Further I noticed that if we use our [`__use`](https://github.com/apollographql/apollo-client/blob/8e3edd4f5e5191453ba3ca1a1cc4fc4a02b936e8/src/react/hooks/internal/__use.ts#L15-L26) polyfill that throws a Promise instead of `use`, the test finishes in under 500 milliseconds - still slower than React 18, but *significantly* faster than React 19 with native `use`. This is the test in question: https://github.com/apollographql/apollo-client/blob/8e3edd4f5e5191453ba3ca1a1cc4fc4a02b936e8/src/react/hooks/__tests__/useSuspenseQuery.test.tsx#L9519-L9615 I'd be happy to work with you on further identifying the root cause for this, but I'll be moving houses in a few days, and I just don't have the time to create an isolated reproduction for this within the next 1-2 weeks, I'm really sorry. Still, I assume this might be important for you, so I'll at least open a ticket to let you know :)
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