perf(desktop): coalesce streaming text/reasoning deltas per animation frame#3114
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perf(desktop): coalesce streaming text/reasoning deltas per animation frame#3114HUQIANTAO wants to merge 2 commits into
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… frame The agent stream pushes a text/reasoning delta per Webview event; at 200 tok/s that is one state update every ~5ms, while rAF is 16ms — so the reducer was running 3-4 times per visible frame and the React tree was re-rendering the entire Message list each time. Add lib/rafBatch.ts: a tiny rAF-coalescing queue with a synchronous drain() so non-text events (tool_dispatch, usage, notice, turn_started/ done, message) flush any pending deltas first to keep causal ordering intact. Drain is also called on unmount so a turn-end that races the teardown doesn't strand the last few tokens in the buffer. tsc --noEmit passes; Go build ./desktop/... is clean.
… frame The agent stream pushes a text/reasoning delta per Webview event; at 200 tok/s that is one state update every ~5ms, while rAF is 16ms — so the reducer was running 3-4 times per visible frame and the React tree was re-rendering the entire Message list each time. Add lib/rafBatch.ts: a tiny rAF-coalescing queue with a synchronous drain() so non-text events (tool_dispatch, usage, notice, turn_started/ done, message) flush any pending deltas first to keep causal ordering intact. Drain is also called on unmount so a turn-end that races the teardown doesn't strand the last few tokens in the buffer. tsc --noEmit passes; Go build ./desktop/... is clean.
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Thanks! This conflicts with the latest main-v2 in useController.ts (other desktop PRs have since landed there). Could you rebase onto the latest main-v2? Note your open desktop PRs also touch App.tsx (#3116, #3126) and useController.ts (#2948) — rebasing them as one ordered chain will avoid repeated conflicts. Happy to merge once green. Thank you! |
This was referenced Jun 6, 2026
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… frame (#3114) (#3501) * perf(desktop): coalesce streaming text/reasoning deltas per animation frame The agent stream pushes a text/reasoning delta per Webview event; at 200 tok/s that is one state update every ~5ms, while rAF is 16ms — so the reducer was running 3-4 times per visible frame and the React tree was re-rendering the entire Message list each time. Add lib/rafBatch.ts: a tiny rAF-coalescing queue with a synchronous drain() so non-text events (tool_dispatch, usage, notice, turn_started/ done, message) flush any pending deltas first to keep causal ordering intact. Drain is also called on unmount so a turn-end that races the teardown doesn't strand the last few tokens in the buffer. tsc --noEmit passes; Go build ./desktop/... is clean. * perf(desktop): coalesce streaming text/reasoning deltas per animation frame The agent stream pushes a text/reasoning delta per Webview event; at 200 tok/s that is one state update every ~5ms, while rAF is 16ms — so the reducer was running 3-4 times per visible frame and the React tree was re-rendering the entire Message list each time. Add lib/rafBatch.ts: a tiny rAF-coalescing queue with a synchronous drain() so non-text events (tool_dispatch, usage, notice, turn_started/ done, message) flush any pending deltas first to keep causal ordering intact. Drain is also called on unmount so a turn-end that races the teardown doesn't strand the last few tokens in the buffer. tsc --noEmit passes; Go build ./desktop/... is clean. --------- Co-authored-by: HUQIANTAO <HUQIANTAO@users.noreply.github.com> Co-authored-by: reasonix <reasonix@deepseek.com>
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The agent stream pushes a text/reasoning delta per Webview event; at 200 tok/s that is one state update every ~5ms, while rAF is 16ms. The reducer was running 3-4 times per visible frame and the React tree was re-rendering the entire Message list each time.
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lib/rafBatch.ts: a tiny rAF-coalescing queue with a synchronousdrain()so non-text events (tool_dispatch, usage, notice, turn_started/done, message) flush any pending deltas first to keep causal ordering intact. Drain is also called on unmount so a turn-end that races the teardown doesn't strand the last few tokens in the buffer.tsc --noEmitpasses;go build ./desktop/...is clean. Frontend test spec is included as a contract test to be enabled when vitest is added.