perf(tui): keep long conversations responsive - #1119
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Cache render(width) output in the transcript container and message components, returning cached lines when content, theme, and width are unchanged. Removes the per-frame full-transcript re-render that caused the TUI to lag as history grew.
Keep the TUI responsive as conversations grow by bounding the live transcript: - Sliding window: keep only the most recent 50 turns in the component tree; older turns are destroyed (entry + component). - Step merging: within each turn, keep only the most recent 30 thinking / tool steps rendered; older ones collapse into a summary. - Expand (Ctrl+O) only reaches the most recent 3 turns. All thresholds are overridable via KIMI_CODE_TUI_* env vars; 0 disables the corresponding feature.
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# Conflicts: # apps/kimi-code/src/tui/components/messages/user-message.ts # apps/kimi-code/src/tui/kimi-tui.ts
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* perf(tui): cache rendered message lines across frames Cache render(width) output in the transcript container and message components, returning cached lines when content, theme, and width are unchanged. Removes the per-frame full-transcript re-render that caused the TUI to lag as history grew. * perf(tui): bound transcript with sliding window and step merging Keep the TUI responsive as conversations grow by bounding the live transcript: - Sliding window: keep only the most recent 50 turns in the component tree; older turns are destroyed (entry + component). - Step merging: within each turn, keep only the most recent 30 thinking / tool steps rendered; older ones collapse into a summary. - Expand (Ctrl+O) only reaches the most recent 3 turns. All thresholds are overridable via KIMI_CODE_TUI_* env vars; 0 disables the corresponding feature. * chore: add changeset for tui transcript window * chore(tui): remove KIMI_TUI_PERF render timing log (cherry picked from commit b0b2aee)
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Related Issue
N/A — no linked issue; see Problem below.
Problem
In long conversations the TUI gets progressively sluggish. The transcript grows without bound and, on every frame, every message component is re-rendered in full even when nothing changed.
What changed
Two complementary changes keep the terminal responsive as history grows:
The transcript thresholds are tunable via
KIMI_CODE_TUI_*environment variables, and a value of0disables the corresponding feature.Checklist
gen-changesetsskill, or this PR needs no changeset.gen-docsskill, or this PR needs no doc update.