The routes page loaded ~924KB of API data upfront (summary 366KB +
token-candidates 558KB), but token-candidates was only needed when
expanding cards, opening panels, or using filters. This caused a ~3s
element render delay blocking LCP.
Changes:
- Split load() so first paint only fetches routesSummary (366KB)
- Preload token-candidates in background via requestIdleCallback
- Wrap candidates state updates in startTransition to avoid UI jank
- Convert 3 heavy O(routes×models) useMemo indices to lazy per-route
computation with ref-based cache (candidateIndex, missingTokenIndex,
missingTokenGroupIndex)
- Guard 4 ManualRoutePanel-only useMemos with showManual check
- Convert 2 derived useMemos to per-route getter functions
- Add loadCandidates() calls at 7 interaction trigger points
Hureru
92fd5e034d