perf: Fix LCP delay and remove hardcoded polyfill bundle#109
Merged
vibemarketerpromax merged 1 commit intomainfrom Feb 19, 2026
Merged
perf: Fix LCP delay and remove hardcoded polyfill bundle#109vibemarketerpromax merged 1 commit intomainfrom
vibemarketerpromax merged 1 commit intomainfrom
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- Remove opacity:0 initial state from hero CSS animations. The browser won't count invisible elements as LCP, so setting opacity:0 in CSS delayed LCP from 1.2s (FCP) to 2.9s (animation completion). Using animation-fill-mode: both lets keyframes handle the 0→1 transition without an explicit initial invisible state. - Filter out Next.js hardcoded polyfill-nomodule CopyFilePlugin. Next.js unconditionally bundles a 68 KiB polyfill chunk (Array.at, flat, Object.fromEntries, etc.) via CopyFilePlugin regardless of browserslist. Our targets (Chrome 109+, Safari 17+, Firefox 115+) don't need these. The previous polyfill-module alias only removed the smaller 1.4 KiB file.
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Summary
opacity: 0as initial state, which prevented the browser from counting hero elements as LCP until animation completed (~1.7s delay). Switched toanimation-fill-mode: bothwhich lets keyframes handle the opacity transition without an explicit invisible initial state.polyfill-nomodulechunk viaCopyFilePluginregardless of browserslist targets. Our previous alias only removed the smallerpolyfill-module(1.4 KiB). This filters out the CopyFilePlugin entirely, eliminating 13 KiB of legacy JS warnings and ~26 KiB of unused JS.Expected impact
Test plan
/services/prometheus-monitoring— LCP should drop to ~1.2s