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⚡ Bolt: Defer expensive text analysis during streaming #42

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⚡ Bolt: Defer expensive text analysis during streaming #42

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3 changes: 3 additions & 0 deletions .jules/bolt.md
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## 2024-05-24 - [Defer Expensive Synchronous Work During Fake Streaming]
**Learning:** Fake text streaming with `setInterval` at rapid intervals (e.g. 24ms) can severely block the main thread if expensive synchronous computations (like text analysis/scoring) depend directly on the streaming state.
**Action:** Always wrap rapidly changing state in `useDeferredValue` before feeding it into expensive `useMemo` hooks to keep the UI thread unblocked.
9 changes: 7 additions & 2 deletions apps/quill/client/components/playground-view.tsx
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@@ -1,6 +1,6 @@
import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
import { AnimatePresence, motion } from "framer-motion";
import { useEffect, useMemo, useRef, useState } from "react";
import { useDeferredValue, useEffect, useMemo, useRef, useState } from "react";
import { USE_CASE_PRESETS } from "../../src/lib/presets";
import { analyzeText, scoreDeterministic } from "../../src/lib/rubric";
import type { Guide, UseCase } from "../../src/lib/types";
Expand Down Expand Up @@ -255,7 +255,12 @@ export function PlaygroundView({
};
}, [output]);

const snapshot = useMemo(() => analyzeText(visibleOutput), [visibleOutput]);
const deferredVisibleOutput = useDeferredValue(visibleOutput);

const snapshot = useMemo(
() => analyzeText(deferredVisibleOutput),
[deferredVisibleOutput]
);
const { score, details } = useMemo(
() =>
guide
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