Deliver fast apps even faster
summary
Ember app diagnosis shows DOMContentLoaded at ~12.5s and TTI at ~19s on slow 3G; adding link rel=preload for bundles saves ~200ms, preloading route JSON moves TTI down ~5–6s by loading model data earlier, and proper HTTP caching with fingerprinted filenames plus immutable headers yields DOMContentLoaded ~4.3s from disk. Watch for SRI breaking preload causing double downloads, use Link headers or preconnect for host latency, run asset-size-reporter and ember-auto-import to find surprising bundle regressions.
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chapters (5)
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