Measured on a copy of a real 1.2 GB / 253K-event database, 10 simulated
browsers + 10 hooks/s for 90 s: event-loop delay p99 1239 ms → 32 ms (max
2.0 s → 94 ms), 266 failed requests → 0, 74 → 111 requests/s served, server
RSS 633 → 346 MB. Entry bundle 975 KB raw → 394 KB (106 KB brotli).
Server
- /api/analytics: the events-table scans run in the read worker
(scoped-stats eventAggregates, read-pool job analyticsEvents); runRead takes
maxAgeMs — analytics 10 s, /api/workflows 30 s — keyed by the args
- /api/workflows/skill-usage: +event_type and a tool_name range instead of
LIKE, so it uses idx_events_tool (784 ms → a few ms)
- idx_events_session_type_tool (session_id, event_type, tool_name,
created_at) replaces idx_events_session_type: covering reads for session
stats, the hook dedupes and the import resume point (1.2 s → 20 ms); 64 MB
cache_size and 256 MB mmap_size on both connections
- WAL: the server sets wal_autocheckpoint = 0 and checkpoints PASSIVE every
DASHBOARD_WAL_CHECKPOINT_MS (5 s) from the read worker's own writable
connection; a failed checkpoint restores the automatic one (hook COMMIT p95
109 ms → 15 ms at 100 hooks/s)
- tmux: one list-sessions answers a whole GET /api/lanes and the heal beat
(liveSessions), shared for 1 s and cleared by this process's new/kill —
GET /api/run's sync spawns had blocked 60 s of a 90 s run; the heal beat
skips tmux when nothing runs; attach options chained into 2 spawns
- hooks: TurnDuration/APIError deduped against one read per hook instead of a
query per transcript entry (23 ms/hook on a 763-turn session); one lane
scan per hook; hourly upserts skip rows that did not grow; frames are sent
after the transaction commits (and after the pane binding); new_event
carries its row id; a split pane's (slot 1–9) hooks no longer rebind the
lane's session_id
- watchdog liveness probe runs ps asynchronously; transcript newline scan via
indexOf; startup subagent backfill fingerprints the files it already checked
- pty attach: backpressure (pause past 1 MB unsent, resume under 256 KB)
- static: hashed assets served from their pre-compressed .br/.gz sibling
Client
- hidden tabs neither refetch on WS events nor poll (useLiveRefresh, panes,
lane cards, git header, changes panel, settings); no per-tab hourly
/updates/check (the server already checks)
- refetch storms throttled (workspace tree/session list 3 s, /api/run only on
a run-key change, notification pane lookup only when shown); WS reconnect
jitter; terminal retry backoff 1.5 → 30 s, stops on 1008
- heavier throttles for aggregates (15 s) and detail views; Monitor keepIfSame;
GET in-flight dedupe in request()
- lazy Dashboard/History, xterm (with the first terminal), lane modals, Sagi
(only while enabled); only the active locale loads; Workspace chunk
prefetched on a /workspace deep link
- Sagi: no work while disabled, pupil via CSS variables, memo avatar
- build: .br/.gz siblings, sourcemap hidden; service worker no longer caches
/assets/ (cache v3 drops the old one)
Tests: scripts/test-server.js drops the GIT_DIR-family variables a hook
exports, so a suite run from a linked worktree's pre-commit can no longer
commit into the real repository or set core.bare.
Docs: ARCHITECTURE, DATABASE, API, DEPLOYMENT, client README,
docs/plans/perf/README.md (audit, checklist, results).
- Workspace, SettingsHub, SessionDetail and the Workflow sub-tab are lazy
(main bundle 2,166 kB -> ~920 kB), wrapped in RouteErrorBoundary: a stale
chunk after a self-update reloads once (vite:preloadError too), any other
error shows a Reload panel instead of a blank page.
- Live refresh: lib/throttle.ts + hooks/useLiveRefresh.ts replace trailing
debounces that froze under a steady event stream; refresh skips hidden
tabs and refetches after a WebSocket reconnect. Monitor loads only while
shown, with one batched GET /api/agents?session_ids= instead of N+1; a
failing endpoint is an inline error, not a blank Dashboard.
- NeedsYouStrip on Monitor and above Analytics. Tabs, filters, page, sort
and search live in the URL (Dashboard, Sessions, Activity, SessionDetail).
- Sessions: tool / workspace / date-range filters, CSV/JSON export
(formula-neutralised), focusable row links, Open in workspace (the dead
/run links are gone), stale responses dropped, error + Retry.
- Fixes: "NaNs" durations, 30/7-day charts skipping idle days, weekday
labels west of UTC (now averages), cache hit rate denominator, billable
tokens vs cache reads, exact tool-call counts, "To" date = end of day,
invalid ?from= no longer throws, recent list no longer shrinks to 15,
stable message keys, transcript switch races.
- Light-theme-unreadable bg-black code panels and dark-only DAG fills use
tokens; status configs and chart colours use theme tokens; Health tab
and other literals translated.
- Server (additive): GET /api/agents?session_ids=, GET /api/sessions
awaiting=1&from=&to=, stats tool_call_count/distinct_tool_count, event
rows carry session/agent labels.
Restores the five analytics sections that turned out to be worth keeping
(patterns, model delegation, error propagation, session complexity, compaction
impact) and reworks what the page opens on.
The lane panel no longer mirrors the Workspace's live lane strip. It now
answers the question the strip cannot: how often each pipeline node actually
passes. GET /api/lanes/pipeline-stats aggregates every stage record of every
lane AND every archived feature — a lane's own `stages` only holds its current
feature, so without the archive the history resets each time a lane starts new
work. Evidence-backed passes are counted apart from bare claims, the same line
the pipeline map draws between `done` and `passed-no-evidence`.
Beside it, GET /api/workflows/skill-usage reports which skills and plugins the
sessions actually reach for. Only PreToolUse rows are counted: every call also
emits a PostToolUse, and counting both would double every number. A plugin's
total includes calls to the MCP tools it ships, so one used purely through MCP
does not read as unused.
Still dropped from issue #6: the agent collaboration network and the subagent
effectiveness scorecards.
nntrivi2001