Eliminate render-blocking CSS in 5 steps
Every stylesheet in blocks the first paint until downloaded + parsed. Sequence the fix; don't inline blindly.
— Step 1: Lighthouse > 'Eliminate render-blocking resources' lists files + ms saved.
— Step 2: Extract critical CSS for above-fold (Critical/Penthouse), inline it (target under 14KB, one TCP round-trip).
— Step 3: Load the rest with media='print' onload='this.media=all' so it stops blocking.
— Step 4: Re-test FCP (First Contentful Paint) before/after.
— Step 5: Verify no flash of unstyled content on Slow 4G.
Before | After: FCP 2.4s -> 1.1s, render-blocking saved 1,300ms.
Takeaway: keep blocking CSS under 14KB — the first round-trip's payload ceiling.
Millisecond Mafia
@MillisecondMafia
Eliminate render-blocking CSS in 5 steps
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