What is INP by checkout
INP by checkout shows how responsive the checkout funnel point feels after user interactions, aggregating Interaction to Next Paint (INP) across key actions like typing, selecting shipping, or pressing “Pay”.
Healthy INP by checkout sample
Should you worry
In a healthy view, typing and clicks get immediate visual feedback. Shipping changes, promo apply, and payment steps feel snappy.
Unhealthy INP by checkout sample
If INP is slow, main-thread blocking (validation, totals recompute), heavy third-party scripts, or synchronous APIs may delay visible responses and trigger double-submits.
Resolving unhealthy INP by checkout
Go-to action plan to resolve an unhealthy INP by checkout:
Ask Uxi to analyze your INP by checkout values and suggest improvements.
Use Filters to focus on interactions (apply coupon, change address) linked to higher INP.
Simulate INP of the suspected breakdown to see if fixing it will resolve the INP by checkout. If yes, this is where the resolution focus should be.
Use an automated INP optimization tool like INProve to improve your INP by checkout values.
Once you’ve improved INP, set an alert to be the first to know if it starts worsening again.
Try it yourself
Discover how your website performs with real user data.