Walk a High-INP Checkout
Trace an INP problem from field interaction to main-thread work and targeted mitigation.
Button feels dead Customers tap express shipping and wait nearly half a second before the UI updates. The user problem is responsiveness, not initial load. INP triage Interaction -> long task -> first visual feedback For responsiveness, the winning fix is the one that gives the browser room to paint after input. Add spinner Visual reassurance that cannot appear while the main thread is blocked. The first visible response arrives quickly, even if secondary work continues. INP improves when user-critical feedback gets the main thread before noncritical work does. Name the interaction User action first RUM attribution points to the…
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