⚡ Bolt: Defer expensive rubric calculations during text streaming#47
⚡ Bolt: Defer expensive rubric calculations during text streaming#47aloewright wants to merge 2 commits into
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Co-authored-by: aloewright <3641844+aloewright@users.noreply.github.com>
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Code Review
This pull request introduces performance optimizations to prevent UI blocking during rapid text streaming in the playground view. It adds a markdown documentation file explaining the issue and uses React's useDeferredValue to defer expensive text analysis and scoring computations. The reviewer suggests deriving an isStale state by comparing the current and deferred output values to visually indicate to the user when the displayed analysis results are out-of-sync with the latest text.
| const deferredOutput = useDeferredValue(visibleOutput); | ||
| const snapshot = useMemo(() => analyzeText(deferredOutput), [deferredOutput]); |
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When using useDeferredValue to defer expensive computations during rapid state updates (like text streaming), the UI can display a temporary mismatch between the latest streamed text (visibleOutput) and the deferred analysis results (snapshot, score).
To prevent user confusion, it is a recommended UX best practice to visually indicate when the deferred calculations are stale (out-of-sync with the current text). You can derive this state by comparing the current and deferred values, and then use it to apply a visual treatment (such as reducing the opacity of the <RubricSnapshot /> container or showing a subtle loading indicator) while the background calculation is pending.
const deferredOutput = useDeferredValue(visibleOutput);
const isStale = visibleOutput !== deferredOutput;
const snapshot = useMemo(() => analyzeText(deferredOutput), [deferredOutput]);
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| const deferredOutput = useDeferredValue(visibleOutput); | ||
| const snapshot = useMemo(() => analyzeText(deferredOutput), [deferredOutput]); |
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Because the rubric is still rendered whenever visibleOutput.length > 0 below, switching the calculation to deferredOutput lets the UI show a non-empty output with a snapshot from the previous deferred value. This happens at the start of a first stream (zeros can be shown while text is already visible) and especially when running again after a previous result, where the old result's score/details can remain visible until the deferred render catches up. The snapshot display should be gated off the same deferred value or indicate it is stale while deferredOutput !== visibleOutput.
Useful? React with 👍 / 👎.
Co-authored-by: aloewright <3641844+aloewright@users.noreply.github.com>
💡 What: Wrapped the
visibleOutputstate inuseDeferredValuebefore passing it toanalyzeTextinsideuseMemoin the playground view. Added comments explaining the purpose.🎯 Why: The playground view simulates text streaming by slicing and updating
visibleOutputevery 24ms. Synchronously runninganalyzeTextandscoreDeterministicon every tick of a long output can block the main thread and cause jitter in the streaming animation.📊 Impact: Reduces main-thread blocking during fake text streaming. React will now defer the expensive analysis calculations to a lower-priority render phase, dropping intermediate frames if necessary, ensuring the text streaming animation remains smooth.
🔬 Measurement: Verify by running the playground text generation against a long output stream and profiling the main thread—there should be fewer long tasks caused by
analyzeTextduring the streaming phase.PR created automatically by Jules for task 732201737328956941 started by @aloewright