perf(mobile): streaming and provider pushes re-render less on the thread screen by juliusmarminge · Pull Request #20963 · pingdotgg/t3code

juliusmarminge · 2026-10-17T17:58:33Z

Mobile thread readers subscribed to streaming-only shell fields and provider status changes they did not use. Read the shared quiet shell and provider-free config atoms where appropriate; keep live timestamps in the visit watermark leaf and full provider catalogs in prompt links and scheduled tasks. The outbox drain only needs upload limits, so it also uses provider-free config.

Maintainer takeover of #20963, originally by @juliusmarminge. Merged main while preserving its React Compiler refactoring. Removed two unnecessary test mock renames; no new regression tests were needed because the shared atom behavior and outbox flows already have coverage.

Verification: 213 focused tests passed across 16 mobile/shared files. Mobile typecheck and scoped lint passed (14 existing warnings). Opus and Sol full-diff reviews found no code defects. Native render counts and the extracted visit watermark have not been exercised on this head. This is a subscription change with no visual layout change; screenshots would not establish the performance claim. No new native speedup is claimed. macOS, Windows, iOS, Android, and Electron desktop were not exercised in this headless Linux takeover. Human native verification remains necessary.

The Browser panel could not start because the host lacks Chromium system libraries; no browser screenshots were captured.

Historical device measurements do not establish a reliable performance gain on compiled main. The original body reported 41→35 renders per commit for the open-thread scenario; a later measurement reported 68→73 and more commits in the measurement window. Those runs predate this takeover. A sustained current-head native comparison and visit/unread check remain required before claiming readiness.

Implemented with GPT-6.1-Sol through the Codex harness in T3 Code. Tests reviewed with GPT-6 Astra; adversarial reviews with Claude Opus 5.5 and GPT-6 Sol.

macroscopeapp · 2026-10-17T18:00:49Z

Approvability

Verdict: Needs Human Approval

Macroscope's review found this PR requires human approval — This PR changes subscription and data-freshness behavior across multiple mobile thread surfaces, including a live-shell side subscription added to preserve visit tracking. The refactor is coherent and performance-focused, but its broad existing-path impact merits native/runtime verification before approval.

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coderabbitai · 2026-10-17T18:05:00Z

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Reviewing files that changed from the base of the PR and between 50431ca and 8cad314.

📒 Files selected for processing: 5

apps/mobile/src/features/keyboard/CommandPalette.tsx
apps/mobile/src/features/threads/ThreadDetailScreen.tsx
apps/mobile/src/native/useOpenPullRequest.ts
apps/mobile/src/state/entities.ts
apps/mobile/src/state/use-thread-selection.ts

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📝 Walkthrough

The mobile app adds quiet thread-shell and presentation configuration readers, migrates thread and configuration consumers, reads shell status directly, and moves thread-visit watermark tracking into a dedicated component.

Changes: Mobile state readers and consumers

Layer / File(s)	Summary
Add thread-shell and configuration readers `apps/mobile/src/state/entities.ts`	Adds `useQuietThreadShell`. `useServerConfigs` reads presentation configurations, while `useServerConfigsWithProviders` retains the provider-inclusive read.
Migrate thread-shell consumers `apps/mobile/src/features/keyboard/`, `apps/mobile/src/features/shortcuts/useAppShortcuts.ts`, `apps/mobile/src/features/threads/`, `apps/mobile/src/native/useOpenPullRequest.ts`, `apps/mobile/src/state/use-thread-selection.ts`	These consumers now read thread shells with `useQuietThreadShell` instead of `useThreadShell`.
Update configuration and outbox reads `apps/mobile/src/features/prompt-links/usePromptLinkResolver.ts`, `apps/mobile/src/features/settings/scheduled-task-editor.tsx`, `apps/mobile/src/state/use-thread-outbox.ts`	Prompt-link and scheduled-task code uses provider-aware configurations. The outbox reads each environment’s status atom directly.

Thread visit tracking

Layer / File(s)	Summary
Extract thread visit-watermark tracking `apps/mobile/src/features/threads/ThreadDetailScreen.tsx`	Moves visit validation, deduplication, and dispatch timing into `ThreadVisitWatermark`, which is rendered with the environment, selected thread, and content-visibility state.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Refactor

Suggested reviewers: maria-rcks, t3dotgg

Merge Risk: 🔵 Low · up to 8cad3

This is a render-performance change with no demonstrated functional break. One open concern is that the outbox may do extra work when provider status changes. This costs some efficiency but should not affect correctness. Native verification of the render counts is still needed.

Pre-merge checks: 4

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Title check		The title clearly describes the main change: reducing unnecessary mobile thread-screen re-renders caused by streaming and provider updates.
Description check		The description explains the problem, implementation, scope, maintainer takeover, verification results, limitations, and required native follow-up. Although it does not use the template headings, it p…

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The description explains the problem, implementation, scope, maintainer takeover, verification results, limitations, and required native follow-up. Although it does not use the template headings, it provides the required information in clear paragraphs.

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juliusmarminge · 2026-10-17T20:32:58Z

Render measurement with the device harness from #21001, scenario stream-reply: an open thread streams a Claude Haiku 5.5 turn while the composer is idle, with a 12 s window mid-stream. Median of 3 on the same base (main 13aa882, then main + this branch merged). Device: Android emulator, Pixel 9 API 36, on nucbox-1. The dev build counts every component React rendered in a commit, using the bailout-aware fiber walk.

	main	+#20963	Δ
feed	633	741	+17%
composer	425	595	+40%
header	470	470	0%
other	863	923	+7%
total	2391	3001	+26%
commits	35	41	+17%
renders per commit	68	73	+7%

Runs (total renders / commits): main 2391/35, 2379/35, 2398/33; +#20963 3001/41, 3089/42, 2136/34.

Component (excluding host primitives)	main	+#20963
AnimatedComponent(View	88	106
AppSymbolView	50	68
IconButton	57	66
PressabilityDebugView	30	44
Host	31	37
TextInputHostProvider	31	37
HostView	31	37
RNHostView	32	36
NativeThemeHost	28	32
SlotView	24	29
AppText	12	18
AnimatedComponent(Component	16	17
WorkingTimer	17	17
AndroidAnchoredMenu	14	17
GlassSurface	10	14

Top causes, main (excluding host primitives):

AnimatedComponent(View props:style,children: 51
AppSymbolView parent-same-props<-View: 32
TextInputHostProvider props:children: 30
PressabilityDebugView parent-same-props<-View: 30
HostView props:style,children: 26
RNHostView props:children: 20
NativeThemeHost props:style,children: 19
Host props:style,children: 19

Top causes, +#20963 (excluding host primitives):

AnimatedComponent(View props:style,children: 66
PressabilityDebugView parent-same-props<-View: 44
AppSymbolView parent-same-props<-View: 42
TextInputHostProvider props:children: 36
HostView props:style,children: 30
NativeThemeHost props:style,children: 22
Host props:style,children: 22
IconButton props:modifiers,onGlobalEvent,onButtonPressed: 22

The thread shell components rendered the same number of times on both: ThreadRouteScreen, ThreadDetailScreen, ThreadFeed and ThreadHeader at 5 per window on main and 4–6 here. The composer subtree went from 5 to 7 renders in two of three runs (ThreadComposer, ComposerSurface, the dictation toolbar). ThreadVisitWatermark appeared with 7 renders. Total renders per commit barely moved (68 → 73); most of the total difference comes from more commits in the window, which depends on provider pace.

Caveat on the scenario: Haiku streamed its reasoning item, then delivered the reply text in one update, so the window covers reasoning deltas. The quiet-shell benefit may show more on a provider that streams reply text token by token.

Claude Opus 5.5 via Claude Code.

…ead screen Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

github-actions · 2026-10-18T03:36:52Z

Thread transfer impact

⚠️ The latest CI run did not produce a thread transfer result for 50431ca.

This comment will update automatically after the next completed run.

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Actionable comments posted: 1

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Inline comments:
Review comments at @apps/mobile/src/state/use-thread-outbox-drain.ts:
- Line 605: Update the server-config hook used by the drain logic to use
useServerConfigs instead of useServerConfigsWithProviders, since serverConfigs
is only needed for maxUploadBytes and provider-status updates should not trigger
queue scans.

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Reviewing files that changed from the base of the PR and between d143894 and 50431ca.

📒 Files selected for processing: 3

apps/mobile/src/state/use-thread-outbox-drain.permissions.test.ts
apps/mobile/src/state/use-thread-outbox-drain.test.ts
apps/mobile/src/state/use-thread-outbox-drain.ts

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juliusmarminge · 2026-10-19T02:10:43Z

Taking over this one. I'll resolve conflicts with current main, retain the live visit tracking and provider-dependent paths, and push the focused change to this branch.

# Conflicts: # apps/mobile/src/features/threads/ThreadDetailScreen.tsx # apps/mobile/src/state/use-thread-selection.ts

Dismissing prior approval to re-evaluate 8cad314

github-actions Bot added the vouch:trusted PR author is trusted by repo permissions or the VOUCHED list. label Oct 17, 2026

juliusmarminge added the macroscope-review Opt PRs made by unvouched contributors in for Macroscope review. Vouched contributors auto-reviews label Oct 17, 2026

github-actions Bot added the size:L 100-499 changed lines (additions + deletions). label Oct 17, 2026

juliusmarminge mentioned this pull request Oct 17, 2026

test(mobile): measure renders on a device #21001

Merged

perf(mobile): streaming and provider pushes re-render less on the thr…

50431ca

…ead screen Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

juliusmarminge force-pushed the perf/mobile-narrow-atoms branch 2 times, most recently from d143894 to 50431ca Compare October 18, 2026 03:34

macroscopeapp Bot previously approved these changes Oct 18, 2026

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coderabbitai Bot reviewed Oct 18, 2026

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Comment thread apps/mobile/src/state/use-thread-outbox-drain.ts Outdated

1kaahu mentioned this pull request Oct 18, 2026

Each provider status change sends every client the whole provider list (0.5–1 MB) #21178

Closed

juliusmarminge self-assigned this Oct 19, 2026

juliusmarminge added 2 commits October 19, 2026 02:11

Merge remote-tracking branch 'origin/main' into perf/mobile-narrow-atoms

026cdb5

# Conflicts: # apps/mobile/src/features/threads/ThreadDetailScreen.tsx # apps/mobile/src/state/use-thread-selection.ts

perf(mobile): keep provider pushes out of outbox scans

8cad314

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perf(mobile): streaming and provider pushes re-render less on the thread screen - #20963

perf(mobile): streaming and provider pushes re-render less on the thread screen#20963
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