* test(desktop): stress long agent sessions in the multitab perf scenario
--tools seeds every transcript with settled tool rounds and drives the live
stream as a working agent turn (tool calls opened and completed between text
chunks), and each tile reveal is timed to next paint (reveal_max_ms) so deep
transcripts report their mount cost.
* perf(desktop): hold the transcript window cut steady while streaming
A fresh weight-walk per store flush slid the cut forward one message at a
time, ~30x/s, and every slide re-indexed the whole windowed transcript —
each row rendered a different message and the runtime repository took its
O(window) rebuild path instead of the one-message update. advanceTranscriptWindow
anchors the cut to a message id and re-cuts once per ~half page of new
content instead of once per flush.
* perf(desktop): stable rows, stepped backfill, pane-shared render budget
Three thread-list fixes for long streaming sessions: memoize the visible-
groups slice and each turn row so a budget-cut advance no longer re-renders
every mounted turn per streamed token; raise the first-paint backfill in
BACKFILL_STEP slices (one bounded commit per frame) instead of a single
20-to-600 transition whose commit landed as a 780ms freeze mid-stream; and
share RENDER_BUDGET across mounted panes so a 4-way grid mounts a quarter
page per pane instead of 4x the fibers.
* fix(desktop): evict settled session states nothing on screen references
Closing a tile never removed its runtime's entry from $sessionStates, so
every tile ever closed parked its full transcript in the map for the life
of the process. Each leftover entry taxes every subsequent stream flush —
the map is spread-copied per delta and the busy/attention/draft projections
walk every entry per publish — so the app got slower the longer it ran,
which users read as "I need to clean my sessions/dbs".
Publish now evicts a settling state when no tile and not the primary view
holds its runtime (transition side effects still fire, so the settle keeps
its unread dot), and closing a tile drops an already-settled state on the
spot. Busy and needs-input states stay: background turns feed the sidebar
dots, and a first publish always lands because a resume can publish a beat
before the surface binds the runtime.
16 tiles streaming in a 2x2 grid with a day's worth of closed-tile residue:
worst-second 34 -> 58 fps, p99 frame 90 -> 28 ms, longtasks 37 -> 0.
* perf(desktop): index lineage aliases per sessions-list reference
lineageAliases scanned the whole recents list per call, and it is called
per cached session state per status projection per message delta — with a
populated sessions DB and a few busy sessions that multiplied out to
millions of row checks a second during streaming. Build the alias index
once per list reference (the list is replaced wholesale, never mutated)
and look aliases up in O(1).
* perf(desktop): journal each in-flight turn under its own storage key
The v1 journal kept every session's tail in one localStorage key, so each
throttled write re-parsed and re-stringified EVERY busy session's snapshot
— a grid of concurrent streams turned that into a whole-store JSON round
trip dozens of times a second, all on the main thread. Per-session keys
make a write O(own tail) no matter how many other sessions are streaming.
A v1 store migrates on first touch; expired/overflow crash residue is
pruned once per renderer.
* perf(desktop): stress the multitab scenario across grid/streaming/DB axes
The one-stack multitab run hid every cost this round of fixes removed: it
drove hook.publish (store only — no journal, no wiring cache), with an
empty recents list and no closed-tile residue. Streaming now routes through
hook.update (the real gateway write path), and the scenario grows axes for
the workloads users actually hit: --zones splits tiles across visible grid
zones, --streaming caps how many sessions are mid-turn (zone leaders
first), --sessions seeds a lived-in recents list, --dead models settled
sessions no surface references. launch.mjs pins HERMES_DESKTOP_CDP_PORT so
a non-default --port survives the app's own dev-CDP flag.
N session tiles stacked as tabs, all mounted (keep-alive) and all
streaming concurrently through the real publishSessionState path — the
"several PR reviews at once" workload. Frame pacing + longtask metrics,
no backend or credits needed; the workload that exposed both fixes above
and the regression gate that keeps them fixed.
brooklyn!