[Programcode]

Summary

• start React and critical CSS immediately; defer Jam and telemetry until load/idle without gating rendering
• replace the visible SEO directory with the existing branded boot shell while preserving crawl-only copy in noscript
• keep the protected shell mounted across sibling routes, move Suspense to page content, and use router navigation for landing CTAs
• remove the idle all-route preload stampede, lazy-load feature exports/telemetry, and enforce emitted module boundaries for PDF, DOCX, charts, ReactFlow, and Admin code
• stop service-worker controller-change reloads while retaining visited-resource runtime caching and offline shell support

Measured result

Controlled production-build measurements and desktop/mobile filmstrips/videos are in docs/performance/startup-navigation-2026-09-19/README.md.

• first real app paint: 769 ms → 464 ms desktop; 1,042 ms → 393 ms mobile
• after-idle startup: 103 → 34 requests; 1,113,865 → 711,360 transferred bytes; 3,665,094 → 2,035,497 decoded bytes
• critical landing JavaScript gzip: 803,351 → 403,438 bytes
• throttled cold paint: 8,381 ms → 4,904 ms
• indefinitely stalled Jam: 3,582 ms → 373 ms desktop; 3,530 ms → 485 ms mobile
• warm Generate → Attack: 421 ms → 157 ms desktop; 1,314 ms → 1,067 ms mobile, with the shell continuously visible

Verification

• npm ci
• npm run docs:check
• npm run lint
• npm run typecheck
• npm test -- --coverage — 1,054 passed; 90.30% statements, 83.00% branches, 92.30% functions, 94.36% lines
• npm run test:edge — 185 passed
• npm run build — passed, including emitted Rollup module-graph boundary check and dist/index.html inspection
• CI=1 PORT=18085 PLAYWRIGHT_BASE_URL=http://127.0.0.1:18085 npm run test:e2e — 179 passed, 1 expected desktop-only test skipped on mobile
• mobile onboarding navigation stress check — 5/5 passed with retries disabled
• independent code/spec reviews completed; all actionable findings addressed

No production or staging deployment was performed. Please leave this PR open for Adam to merge.

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Project	Deployment	Actions	Updated
debate-navigator	Ready	Preview	Sep 19, 2026 8:14pm UTC

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⛔ Files ignored due to path filters (8)

• docs/performance/startup-navigation-2026-09-19/after-desktop-filmstrip.png is excluded by !**/*.png
• docs/performance/startup-navigation-2026-09-19/after-desktop.webm is excluded by !**/*.webm
• docs/performance/startup-navigation-2026-09-19/after-mobile-filmstrip.png is excluded by !**/*.png
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• docs/performance/startup-navigation-2026-09-19/before-desktop-filmstrip.png is excluded by !**/*.png
• docs/performance/startup-navigation-2026-09-19/before-desktop.webm is excluded by !**/*.webm
• docs/performance/startup-navigation-2026-09-19/before-mobile-filmstrip.png is excluded by !**/*.png
• docs/performance/startup-navigation-2026-09-19/before-mobile.webm is excluded by !**/*.webm

📒 Files selected for processing (41)

• README.md
• docs/architecture.md
• docs/performance/startup-navigation-2026-09-19/README.md
• docs/testing.md
• e2e/animation-polish.spec.ts
• e2e/helpers/auth.ts
• e2e/home-navigation.spec.ts
• e2e/loading-performance.spec.ts
• e2e/login.spec.ts
• e2e/startup-shell.spec.ts
• index.html
• package.json
• plans/README.md
• plans/startup-navigation-performance.md
• public/sw.js
• public/theme-init.js
• scripts/check-build-boundaries.mjs
• src/App.tsx
• src/bootstrap.ts
• src/components/WebTelemetry.tsx
• src/components/features/attack/AttackResults.tsx
• src/components/features/brainstorm/BrainstormResults.tsx
• src/components/features/factoids/FactoidsResults.tsx
• src/components/features/generate/GenerateResults.tsx
• src/components/landing/FinalCTA.tsx
• src/components/landing/Hero.tsx
• src/components/landing/Navbar.tsx
• src/components/landing/Pricing.tsx
• src/jam-loader.ts
• src/lib/motion-policy.ts
• src/lib/observability.ts
• src/main.tsx
• src/offline-route-preload.ts
• src/pages/SparringPage.tsx
• src/register-service-worker.ts
• src/test/jam-loader.test.ts
• src/test/motion-policy.test.ts
• src/test/observability.test.ts
• src/test/register-service-worker.test.ts
• src/test/vercel-deployment-config.test.ts
• vite.config.ts

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