Follow-up to #65890 (router transitions off) and #65898 (structural
compare + first-paint budget): profiling the switch path on real 1000+-
message sessions with a new CDP harness showed the remaining freeze is
NOT markdown rendering — it's a forced-reflow cascade from mount-time
layout reads interleaved with style writes across the transcript's
layout effects, plus the first-paint budget cut landing too late to
stop the full-budget commit.
Measured on the two largest local sessions (996 and 1363 messages),
main-thread longtask totals per switch: warm 2450ms -> 557ms and
1158ms -> 194ms; first paint 1690ms -> 444ms. Harness:
scripts/profile-session-switch.mjs (same CDP family as
profile-real-stream.mjs).
- use-resize-observer: drop the synchronous initial callback and ride
the observer's spec-guaranteed first delivery instead (same frame,
after layout, before paint). The sync call ran while the commit's
layout was dirty, so every size read in a callback forced a full
reflow — with one instance per user bubble (measureClamp read
scrollHeight, then WROTE --human-msg-full, re-dirtying layout for the
next bubble), the switch commit thrashed for over a second. Inside RO
timing the same reads are free. Composer metrics (2x
getBoundingClientRect + documentElement style writes) rides the same
fix.
- Same class, same fix at the remaining call sites profiling surfaced:
ExpandableBlock and TerminalOutput (dozens per tool-heavy transcript)
now measure/pin via RO initial delivery; the tool-window and
thinking-preview pins drop their sync pin() call; the thread
timeline's initial active-tick compute joins its existing
scroll-time rAF batching so back-to-back transcript updates coalesce.
- thread/list: cut the render budget in the RENDER phase (state-from-
props adjustment) instead of the post-commit layout effect. The
effect-time cut was too late — on a warm switch React first built and
committed the full 300-part tree, then re-rendered at 60, then bumped
back to 300, so the expensive commit still happened (and on a cold
switch the bump rAF usually fired while the transcript was still
empty, so the prefetched messages rendered at full budget anyway).
The render-phase cut restarts the component before any child renders;
a second trigger handles the cold path where messages land later
under the same sessionKey.
- thread/list: backfill 60 -> 300 inside startTransition so the older
turns' markdown+shiki render is interruptible background work instead
of a synchronous freeze one frame after the switch paints. Functional
Math.max so an urgent "Show earlier" click can't be rebased back down.
- composer focus: skip the rAF/timeout focus retries when the element
is already focused — focus() runs the full focusing steps (forcing
layout) even on the active element, ~585ms per switch on a large
dirty DOM.
- Replace the tautological render-budget test (it re-declared the
constants locally and asserted 60 < 300) with behavior tests of the
now-exported buildGroups + firstVisibleGroupIndex.
Verification: apps/desktop `npx tsc --noEmit` clean; full
`npx vitest run` 210 files / 1763 passed; manual CDP check confirms the
deferred backfill commits the full transcript, stays pinned to bottom,
and "Show earlier" still pages.
Post-hoc sprite removal is a losing battle (three inpainting strategies
failed QC on letter-edge overlap frames). The production answer: sprites
are BillboardComponent/SpriteComponent/ArrowComponent subobjects — set
bVisible:false via ObjectTools (remove_component fails on default
subobjects), swept scene-wide in one ProgrammaticToolset script
(148 actors, 13 sprites, one round-trip, verified).
New references/advanced-workflows.md covering the sophisticated-workflow
surface, each section exercised against a running editor:
- ProgrammaticToolset batching: full contract (get_execution_environment
gate, execute_tool fully-qualified names, JSON-string inputs,
returnValue unwrapping, allowed imports) + a verified worked example
(12-column colonnade, 36 components in one round-trip vs 37 serial calls)
- Blueprint DSL authoring loop, verified end-to-end: create -> list_graphs
-> get_graph_dsl_docs -> find_node_types per node -> write_graph_dsl ->
compile_blueprint -> spawn instance. Every node-ID gotcha hit live is
recorded (EventTick not Tick, Math|Rotator|MakeRotator, registry
categories vs doc categories, no (self) node)
- PIE session options schema (bSimulate/playMode/warmupSeconds/
startTransform, out-of-process downgrade behavior)
- Sequencer orientation: 140-tool surface mapped by capability group +
sibling keyframing/controlrig/conditions toolsets + minimal cinematic
skeleton
- LogsToolset self-debugging, AutomationTestToolset CI loop,
SemanticSearch, ConfigSettings, project AgentSkillToolset precedence
- Per-situation decision table
New pitfalls from this round's live failures: 10b (refPath-object vs
plain-string params; schema-in-error as tiebreaker), 10c (DSL node IDs
must come from find_node_types). SKILL.md: batching exception wired into
the operating loop, reference table row, description updated.
Ran the full loop against a real editor (blank project, ModelContextProtocol
+ ToolsetRegistry + AllToolsets enabled): raw MCP handshake, discovery walk,
environment relight for golden hour, primitive monument build, virtual-camera
captures with vision judgment, exposure debugging, annotated spatial capture.
67 toolsets advertised; every dispatch semantic below observed, not inferred.
Corrections and additions from the live run:
- Qualified toolset names (editor_toolset.toolsets.scene.SceneTools) with
SHORT tool_name; TOptional params must be explicit null; find_actors
requires ''/[] for its schema-required optionals; ObjectTools values is a
JSON *string*; refPath object references; returnValue wrapping; per-property
failure lists with schema-in-error
- HTTP wire contract: initialize=JSON + session header, tools/call=SSE frame
after game-thread completion (plain-JSON clients read empty body)
- CaptureViewport as virtual camera (captureTransform, meter-unit annotation
grid + actor callouts) verified with pixel evidence; recipes rewritten to
use it instead of viewport piloting
- New pitfalls from real failures: template-level environment-actor
duplication compounding into whiteouts (find-first/spawn-if-missing rule),
template exposure calibration vs physical lux (12b), objective exposure
check via ffprobe YAVG (12c), untitled-level Save-As modal deadlock,
macOS full-Xcode + Metal Toolchain requirement (xcodebuild
-downloadComponent MetalToolchain)
- Live toolset census (67 on blank project), LogsToolset/ConfigSettings/
SemanticSearch highlights, UE EULA 6(e) licensing note
Desktop launch and the update-chain rebuild install npm deps whose child
scripts shell out to a bare `node` (e.g. electron-winstaller's
select-7z-arch.js). When launched from the desktop updater chain
(Desktop -> hermes-setup -> hermes update) the shell PATH customizations are
lost, so the install dies with `'node' is not recognized` / `node: not found`.
- cmd_gui: wrap the npm-install env with with_hermes_node_path(_nixos_build_env())
so managed Node is prepended even on a stripped PATH — mirrors the idiom
already used by the update deps refresh. (The original fix merged nixos_env
on TOP of the managed env, whose full os.environ copy clobbered the managed
PATH back to bare; wrapping fixes that merge order.)
- _cmd_update_impl: spawn the `desktop --build-only` subprocess with
with_hermes_node_path() so the child starts with managed Node from the outset.
Regression test: the desktop install env now prepends the managed Node dir
ahead of a bare updater PATH instead of passing env=None.
Co-authored-by: F4TB0Yz <jfduarte09@gmail.com>
The web dashboard runs inside the gateway process, so `os.environ` carries
`_HERMES_GATEWAY=1`. `_spawn_hermes_action` spread that into the subprocess env,
so a spawned `hermes gateway restart` (dashboard "Enable webhooks", Telegram QR
apply) tripped the in-process restart-loop guard and exited 1 — the gateway
never restarted, but the dashboard reported `restart_started: true` because it
only checks that the spawn succeeded.
Scrub `_HERMES_GATEWAY` from the spawned action's env, matching what the
gateway's own restart watcher already does (gateway/run.py).
Fixes#52470. Adds a test asserting the spawned env drops the loop-guard var
while keeping HERMES_NONINTERACTIVE.
* fix(dashboard): unblock basic auth plugin during interactive password setup
When the dashboard prompts for username/password on a non-loopback bind,
also remove the bundled basic provider from plugins.disabled so
discover_plugins(force=True) can register it (#54489).
* test(dashboard): cover basic auth plugin blocked by plugins.disabled
Regression harness for #54489: credentials in config are not enough when
the bundled basic provider is on the deny-list.
Auto-compression ends the SessionDB session and forks a continuation,
rotating the stored session id. The gateway emits `session.info` with
the new `stored_session_id`, and the desktop's cache entry was updated
via `ensureSessionState` — but the URL route and `$selectedStoredSessionId`
never followed the rotation.
On the next send, `getRuntimeIdForStoredSession(oldStoredId)` returned
null (the cache entry's `storedSessionId` no longer matched the old id),
so `routedSessionNeedsResume` evaluated true, triggering a full
`session.resume` + REST transcript prefetch — the whole thread reloaded.
Fix: a new `$activeSessionStoredId` atom is set in `ensureSessionState`
when the active session's stored id changes. A `useEffect` in
`use-session-actions` subscribes to it and re-anchors the route +
selection (`setSelectedStoredSessionId` + `navigate(replace: true)`),
and cleans up the stale stored→runtime mapping.
`replace: true` because it's the same conversation — compression is
transparent to the user, so back-button stays correct.
* feat(desktop): add useKeybindHint hook and TipKeybindLabel
Add a shared hook that reads the current keybind combo for an action
id from the $bindings store (rebindable) or KEYBIND_READONLY (fixed),
returning a formatted string or null when unbound.
Add TipKeybindLabel — a convenience component that auto-reads both
its label (from i18n) and keybind combo from the action registry.
Pass only actionId for the common case; pass text to override when
the tooltip is context-dependent.
* fix(desktop): replace native title= on buttons with themed Tip
Migrate all <button>/<Button> elements using the native HTML title=
attribute to the instant, themed <Tip> component. Native tooltips are
unstyled, delayed (~500ms OS default), and visually inconsistent with
the app's instant themed tooltips.
Also adds <Tip> wrappers to icon-only buttons that were missing
tooltips entirely (dialog close, search clear, overlay close,
master-detail pane controls, keybind panel rebind/reset buttons).
Adds an enforcement test (no-native-title.test.ts) that scans all
.tsx files for <button>/<Button> with title= and fails if any are
found. Updates DESIGN.md with the icon-only button tooltip rule and
keybind hint guidance.
* feat(desktop): wire keybind hints into button tooltips
Add actionId to TitlebarTool, StatusbarItem, and SidebarNavItem so
their tooltips show the current keybind combo via TipKeybindLabel.
Fix the hardcoded NEW_SESSION_KBD in the sidebar to read from
$bindings so it stays live on rebind.
Wired surfaces:
- Titlebar: sidebar toggle, flip panes, keybinds, settings
- Statusbar: terminal toggle (view.showTerminal)
- Status stack: open agents button (nav.agents)
- Sidebar nav: new session, skills, messaging, artifacts
* feat(desktop): move keybind panel to settings tab with search filter
Move the keyboard shortcuts panel from a Radix Dialog into a proper
Settings tab (/settings?tab=keybinds). The ⌘/ shortcut and titlebar
keyboard button now navigate to this settings tab instead of toggling
a dialog. Adds a search filter to filter shortcuts by label.
- New: src/app/settings/keybind-settings.tsx (extracted from keybind-panel.tsx)
- Delete: src/app/shell/keybind-panel.tsx (dialog wrapper removed)
- Remove: $keybindPanelOpen atom and toggle/open/close functions
- Add: IconKeyboard to lib/icons.ts
- i18n: keybinds.search + settings.nav.keybinds (en, zh, zh-hant, ja)
* refactor(desktop): unify worktree dialog into shared WorktreeDialog
Extract the worktree creation dialog from StartWorkButton (sidebar) into a
shared WorktreeDialog component. Both the sidebar's StartWorkButton and the
composer's CodingStatusRow now use the same dialog, eliminating the duplicated
UI.
The shared dialog keeps the sidebar version's full feature set:
- BaseBranchPicker (filterable base branch combobox)
- Convert mode (check out an existing branch into a worktree)
- Sanitized branch name input
The coding row passes repoPath (from cwd) and onOpenWorktree (which carries
the composer draft to the new session) so the unified dialog works everywhere
there's a repo, not just inside an entered project.
Switching between chat sessions in the desktop app froze for up to ~1–2s on
large transcripts. Profiling the switch path surfaced three main-thread
blockers, fixed here minimally and without changing behavior.
1. JSON.stringify deep-compare (worst case). chatMessagesEquivalent compared
message parts with JSON.stringify(a) === JSON.stringify(b) on every switch.
On image-/large-blob-bearing transcripts this serialized every part twice
and cost well over a second. Replaced with a structural compare that never
stringifies: array-level identity fast-path, per-part reference fast-path,
then type-aware field comparison. The compare's only consumer asks "did the
transcript change, should I setMessages?", so it is deliberately
conservative — a false-negative just causes one extra idempotent
setMessages, while a false-positive (the unsafe direction) is avoided.
2. Scroll-settle loop. thread-list ran a requestAnimationFrame settle loop up
to 90 frames (or 5 stable frames) on every sessionKey change, each frame
forcing a synchronous layout read + write — racing the markdown paint for
up to ~1.5s. A normal synchronous switch stabilizes within a couple
frames, so the ceiling is now 2 stable frames / 15 max.
3. Synchronous first paint of up to 300 parts. On switch, thread-list reset
the render budget to the full RENDER_BUDGET=300, so up to 300 parts went
through markdown + shiki syntax-highlighting synchronously on the switch
commit. It now paints a small FIRST_PAINT_BUDGET=60 first, then bumps to
the full 300 in a requestAnimationFrame after the first commit.
Salvaged from PR #49807 by professorpalmer — re-applied to the restructured
file layout (use-session-actions/utils.ts, thread/list.tsx) and tests merged
into the existing utils.test.ts.
Co-authored-by: Cary Palmer <professorpalmer@users.noreply.github.com>
The sidebar working dot didn't update for background sessions until the
user opened them. Two coupled causes:
1. The gateway's session.info event payload omitted stored_session_id,
so the desktop app had no way to map a background session's runtime
id to its stored id. Without the stored id, setSessionWorking(null,
...) was a no-op — the $workingSessionIds atom never updated.
2. The running→busy transition in the session.info handler was gated on
`apply` (active session only). The gate correctly scopes view-only
side effects (setCurrentModel, setCurrentCwd, etc.) to the focused
chat, but the per-session busy state drives the sidebar indicator and
must reach every session. updateSessionState only mutates the
per-runtime cache entry, and syncSessionStateToView already guards
the view publish to the active session, so ungating is safe.
Fix: add stored_session_id to _session_info() in tui_gateway/server.py,
add the field to GatewayEventPayload, pass it to updateSessionState in
the session.info handler, and ungate the running→busy transition.
generate-patch now emits a has-fixes job output (true/false).
apply-patch is gated on it via `if: needs.generate-patch.outputs.has-fixes == 'true'`,
so when `npm run fix` produces no diff, the privileged job is skipped
entirely — no runner allocation, no redundant checkout/download/push/PR.
Replaces moonshotai/kimi-k2.6 (recommended) and moonshotai/kimi-k2.7-code
with moonshotai/kimi-k3 in both curated lists, regenerates the published
model-catalog.json manifest, and updates the docs example manifest (en+zh).
kimi-k3 verified live on both endpoints (Nous Portal /v1/models and
OpenRouter /api/v1/models; 1M context, $3/$15 per Mtok). Family-prefix
matching already covers k3 in moonshot_schema, cache policy, and context
heuristics — no code changes needed there.
queryRewrite (default off) gates the latest-message rewrite so the
extra auxiliary LLM call is opt-in. firstTurnBaseWait and
firstTurnDialecticWait expose the turn-1 bounded waits in seconds
(0 disables). All three resolve host-block-first like every other
field. Also pins per-host timeout resolution with tests.
Move query_rewrite from the honcho plugin to plugins/memory/ and
rename the auxiliary task key honcho_query_rewrite ->
memory_query_rewrite so any memory provider can use the same
rewrite path and model/timeout config block. No behavior change.
dialecticMaxChars (default 600) is documented as the budget for the dialectic
supplement auto-injected into the system prompt every turn — a small recurring
cost that is correct to bound tightly. But dialectic_query() applied that cap
unconditionally, so explicit honcho_reasoning tool calls — where the model
deliberately spends a turn asking for a synthesized answer — were silently
truncated mid-word to 600 chars with a trailing " …", no error surfaced. The
full answer is returned by Honcho server-side; the clip happens client-side.
The auto-injection path already has its own token-based budget (contextTokens,
enforced in prefetch() via _truncate_to_budget), so the char cap's real job is a
cheap always-on guardrail for that recurring injection. Explicit tool results
are already bounded server-side by Honcho's dialectic MAX_OUTPUT_TOKENS and don't
need the injection cap — sibling tools (honcho_search, honcho_context) don't
post-clip their results either.
Add apply_injection_cap (default True, preserving current behavior) to
dialectic_query(); the honcho_reasoning tool handler passes False so it returns
Honcho's full synthesized answer. Auto-injection is unchanged. Tests cover both
the capped injection path and the uncapped tool path.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
honcho_conclude's delete action was unreachable in practice: no tool ever
surfaced a real conclusion id for the model to pass as delete_id.
honcho_search only searches the separate Message resource space, and the
SDK's ConclusionScope.list()/.query() (which do return real Conclusion.id
values) were never wired into any tool.
Adds an optional list mode to honcho_conclude (query to search, omit to
browse recent conclusions), backed by a new
HonchoSessionManager.list_conclusions(). No new tool, no changes to the
create/delete signatures or their conclusions_of() routing.
injectionFrequency='first-turn' returned empty for the entire
prefetch_context() method on turns 2+, which blocked the dialectic
supplement from being consumed and injected. The dialectic has its
own cadence (dialecticCadence) and must continue to fire and inject
independently of the base context layer.
Now first-turn mode gates only Layer 1 (base context: representation
+ card), letting Layer 2 (dialectic supplement) flow through its
normal consumption path on every turn.
Also fixes all remaining tests that passed dialecticCadence via
cfg_extra={'raw': {...}} to use the typed dialectic_cadence field.
injectionFrequency, contextCadence, and dialecticCadence were read
only via raw.get() which checks root-level keys in honcho.json.
Settings placed inside hosts.<name> (the normal per-host location)
were silently ignored, falling back to defaults.
- Add typed dataclass fields: injection_frequency, context_cadence,
dialectic_cadence with host-block-first resolution chains matching
the pattern used by all other config fields.
- Update HonchoMemoryProvider.initialize() to read from typed cfg
fields instead of cfg.raw directly.
- Fix search_context tests that mocked _honcho directly — the
.honcho property getter calls get_honcho_client() which overwrites
the backing field, so use patch.object on the property instead.
- Add injection_frequency and context_cadence config override tests.
HonchoClientConfig timeout/requestTimeout resolution skipped the per-host config
block, silently dropping a host-scoped timeout and falling through to the global
config.yaml value (or the default). Add the host block at the front of the
resolution chain, consistent with every other field (base_url, api_key, etc.).
Symptom: Honcho logs show a dialectic answer was generated, but Hermes never
injects it — intermittently.
Root cause: the dialectic supplement that queue_prefetch() fires at the end of
turn N is stored pending (fired_at=N) for consumption by turn N+1's prefetch().
But prefetch()'s trivial-prompt guard returned early BEFORE the consumption
block. So when turn N+1's prompt was trivial ('ok', 'yes', 'continue', a slash
command), the ready result was never consumed, and a few turns later the
stale-discard guard dropped it. Generated by Honcho, never seen by the model.
The dependence on 'is the consuming turn trivial?' is why the loss looked random.
Fix: trivial turns now consume and inject a ready, non-stale pending result while
still spending no new work (no base-context fetch, no new dialectic fire). A
trivial ack shouldn't generate context, but it shouldn't destroy an answer
already computed for that exact turn. Extracted the pop+stale-check into a shared
_consume_pending_dialectic() used by both the trivial path and the normal path so
they age-check identically.
Preserved (covered by new tests): genuinely stale results are still discarded on
trivial turns; trivial turns still fire no new work; a trivial turn with nothing
pending still injects nothing.
Adds regression tests for inject-on-trivial and discard-stale-on-trivial.
A brand-new session injected no Honcho context on the user's first message —
the peer card/representation only showed up from turn 2 onward. The base-context
fetch was fired asynchronously and popped in the same synchronous pass, so it
always lost the race on turn 1 (a background thread can't finish inside one
pass), leaving the first response with zero recalled context.
Fetch the base layer (representation + card + summary) synchronously with a
bounded timeout on turn 1 so the peer card is injected immediately; subsequent
turns still consume the background-refreshed result primed by queue_prefetch().
The wait is bounded by _FIRST_TURN_BASE_TIMEOUT and tightened further by a small
configured request timeout (fail-fast deployments / tests).
Two related first-turn/dialectic reliability fixes ride along:
- first-turn dialectic no longer double-fires: if a prewarm .chat() thread is
already in flight from session init, turn 1 waits briefly for it instead of
firing a second (duplicate) call that also blocked the first response. The
first-turn wait is decoupled from a large host timeout (a 60s host timeout
must not block the first response for 60s) via _FIRST_TURN_DIALECTIC_CAP,
while still honoring a tight configured timeout.
- empty-pass propagation guard in multi-pass dialectic: at depth > 1 each pass
feeds the prior pass's output into the next prompt. If a pass returned empty
(e.g. a reasoning model that spent its whole budget thinking), the next prompt
carried a blank assessment (the "empty spot" seen in Honcho request logs). Now
only non-empty prior results feed dependent passes; if all priors are empty,
re-issue the base prompt instead of referencing nothing.
The five Honcho tool schemas had overlapping/misleading descriptions, making it
hard for the model to pick the right one, plus two concrete correctness bugs:
- honcho_context advertised an 'Optional focus query' parameter that the dispatch
never read. The model could pass query= expecting filtering that never happened.
Remove the dead parameter; honcho_context is an honest no-query snapshot. Focused
retrieval now lives in honcho_search (see prior commit).
- honcho_conclude's peer param was described as 'Peer to query' — wrong; it's the
peer the conclusion is ABOUT. Corrected.
Rewrite all five descriptions to give each tool a distinct mental model and
cross-reference siblings:
profile = read/write the compact card (cheapest, no query, no LLM)
search = find what was actually said, ranked, cross-session (cheap, no LLM)
reasoning= ask a question, get a synthesized answer (the only LLM tool; expensive)
context = a fixed session snapshot (no query, no LLM)
conclude = write a durable fact to the profile
Addresses the honcho_context query param half of #29402 (see PR notes for the
divergence from that issue's proposed wire-through approach).
honcho_search routed through search_context() -> peer.context(search_query=),
which returns the peer's standing representation + card. The search_query arg
does not turn that endpoint into a search, so results were effectively
query-independent: the same representation blob regardless of the query. Factual
lookups ('what medication', 'which value did we pick') returned noise.
Rewire search_context() to call the workspace message-search endpoint
(Honcho.search) with a peer_perspective filter: RRF-ranked (hybrid semantic +
full-text) raw message excerpts spanning every session the peer was a member of,
across all authors, membership-time-scoped. This is the cross-session factual
recall primitive.
peer_perspective is chosen over the alternatives because it is the only scope
that is simultaneously (a) cross-session, (b) inclusive of assistant-authored
facts about the peer (peer-author search drops these, and they are a large part
of what you want to recall about yourself), and (c) privacy-scoped to the peer's
own sessions (plain workspace search leaks other peers' sessions).
- snippets are labeled by author so the model can tell user-stated facts from
assistant-derived ones
- max_tokens is now an enforced budget (was accepted but meaningless)
- graceful fallback to peer-authored search if peer_perspective is unsupported
- query length clamped under the embedding input cap
Replaces 3 change-detector tests that asserted the old representation-dump
behavior with 4 that assert the message-search contract + fallback path.
auto_title_session runs as a bare daemon-thread target. Any exception
escaping it hits the default threading excepthook and sprays a raw
traceback into the user's terminal mid-session. The canonical trigger
is the post-'hermes update' stale-module window: the function's lazy
imports read NEW source from disk while already-imported modules
(agent.portal_tags) are still the OLD cached version, producing an
ImportError that repeats on every auto-title attempt until the
long-running process restarts (seen live after 9ce0e67f2 added
set_conversation_context).
The public entrypoint now wraps the body in a catch-all that logs one
WARNING naming the likely cause ('restart the running Hermes process'),
routes the exception through the existing failure_callback channel
(user-visible warning in CLI, debug-suppressed in gateway per #23246),
and never re-raises. This also makes the function honor its own
docstring contract ('silently skips if title generation fails').
react-router v7's HashRouter wraps every route state update in
React.startTransition() by default. In React 19's concurrent renderer,
transitions are non-urgent — React can yield mid-render and come back
later. When the app is under load (streaming token deltas, gateway
events, store updates from active sessions), those higher-priority
updates keep interrupting the transition, starving the route change commit.
This matches every symptom of the session-switch lag:
- Main thread is free (animations run, clicks work) — startTransition
defers, it does not block
- navigate() does not take effect for seconds — the transition keeps
getting interrupted by higher-priority updates
- Worse under load — more concurrent re-renders = more interruptions
- The whole UI (sidebar + main pane) does not update — the entire route
change is one transition, so nothing commits until it finishes
Pass useTransitions={false} to HashRouter so route state updates are
synchronous at default React priority instead of deferred transition
priority. navigate() now commits and paints immediately.
See: react-router v7 chunk-BIP66BKV.js HashRouter implementation.
