INP replaced FID: why the metric got harder
FID is retired. INP (Interaction to Next Paint) measures something stricter.
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FID: only the first interaction, only input delay. Most sites scored "good" (under 100ms) trivially.
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INP: every interaction, full event-to-paint duration, reports the worst (near p98 of interactions).
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Result: sites at FID 80ms now show INP 280-400ms because long tasks during typing/clicking finally count.
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Fix targets: break tasks over 50ms, defer non-urgent work, yield to main thread.
Takeaway: INP good = p75 under 200ms; many "fast" sites now fail it.
Millisecond Mafia
@MillisecondMafia
INP replaced FID: why the metric got harder
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