Web perf: gate feeds on visibility + split vendor chunks#20
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- Each weather feed now takes an `enabled` flag tied to its layer's visibility, so a hidden layer costs no fetch or polling. The big win: the 1.8 MB lattice.json no longer loads on every visit — only when temperature (off by default) is switched on. Alerts and the citytile axis still always load (the axis drives the shared timeline). Polling lazy-starts on first enable. - Split the GPU/map vendors (deck.gl/luma/deck-wind-layer, maplibre/react-map-gl) into their own chunks: the app chunk drops from ~1.1 MB to ~286 KB, vendors cache across deploys and download in parallel. (The wind double-decode the audit also flagged is deferred — sharing one texture between the fill raster and the particle layer needs deck-wind-layer to accept a preloaded texture; tracked separately.)
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From the audit (perf lane).
enabledflag tied to its layer. The headline win:lattice.json(1.8 MB) no longer loads on every visit — only when temperature (off by default) is enabled. Hidden layers cost no fetch/poll; alerts + the citytile axis always load (the axis drives the timeline). Verified: enabling temperature lazy-loads the lattice and it renders.Deferred (noted in commit): the wind fill+particle double-decode needs
deck-wind-layerto accept a preloaded texture.tsc, biome, build all pass; chunk split confirmed in the build output.
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