perf(map): preload map chunk at module level with tile CDN hints#15
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…e hints The previous approach waited for requestIdleCallback + next/dynamic render before starting the ~1 MB maplibre-gl chunk download, creating a serial waterfall that delayed map visibility by ~2.5s. Now the chunk downloads during hydration via a module-level import() guarded by matchMedia, and counties data is prefetched in parallel. Preconnect/dns-prefetch hints for basemaps.cartocdn.com and tiles.basemaps.cartocdn.com eliminate DNS+TLS latency for tile loading. Total map load time reduced from ~2.5s to ~1s.
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Summary
next/dynamic+requestIdleCallbackwith module-levelimport()guardedby
matchMedia, so the ~1 MB maplibre-gl chunk starts downloading during hydrationinstead of after idle callback + first render
preconnectanddns-prefetchhints forbasemaps.cartocdn.comandtiles.basemaps.cartocdn.comto eliminate DNS/TLS latency for tile loadingmatchMediaguard prevents unnecessary downloadsResult
Map load time (page load to tiles ready): ~2.5s → ~1s
Test plan