perf(web-shell): lazy-load chat & activity feeds to fix DM-view lag#41
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Entering a DM mounted the entire transcript plus the fully-expanded
activity timeline, and the activity pipeline (clip → filter →
buildThread) was recomputed from scratch on every arriving WS row —
quadratic in turn count because hashMessage re-serialized each
exchange's full prefix.
- Add useWindowedList: render only a trailing window of each feed,
grown a page at a time, reset on context switch.
- Add thread-history: per-thread lazy history paging (hydrateThread +
loadOlderThreadMessages). Closes a gap where DM views only showed
whatever the global backfill happened to include.
- messages.ts: appendMessages fast-path concat (no full re-sort) for
in-order arrivals; add prependMessages for paging.
- AgentTimeline: memoize the clip/filter/buildThread pipeline and
objectivesSeen; WeakMap-cache hashMessage so each payload is
serialized once per page; window TimelineBody.
- Transcript: windowed render + scroll-anchored "load older" bar;
hydrate the thread's first page on open.
First paint is now bounded (~80 message rows / ~60 thread items) and
the per-WS-frame cost drops from a full quadratic pipeline to a memo
hit plus a window slice.
Signed-off-by: Andrew Jon Przybilla <andrew@przy.email>
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Entering a DM mounted the entire transcript plus the fully-expanded
activity timeline, and the activity pipeline (clip → filter →
buildThread) was recomputed from scratch on every arriving WS row —
quadratic in turn count because hashMessage re-serialized each
exchange's full prefix.
First paint is now bounded (~80 message rows / ~60 thread items) and
the per-WS-frame cost drops from a full quadratic pipeline to a memo
hit plus a window slice.
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git commit -s) — the DCO bot will confirmpnpm lintis cleanpnpm typecheckis cleanpnpm testpasses