Interaction to Next Paint (INP)
Interaction to Next Paint (INP) measures responsiveness to user interactions. As a Core Web Vital since March 2024, INP replaced FID. SaaSalyst checks your INP score using Chrome User Experience Report (CrUX) data via the PageSpeed Insights API.
What SaaSalyst Checks
SaaSalyst extracts INP data from the Chrome User Experience Report (CrUX) via the PageSpeed Insights API. INP measures the latency of all user interactions (clicks, taps, key presses) and reports the worst interaction at the 75th percentile. Sites without sufficient traffic may not have CrUX data — in that case, this check is skipped.
Why This Matters
INP is a Core Web Vital as of March 2024, replacing First Input Delay (FID). Google uses INP as a ranking signal for search results.
Poor INP means users experience lag when interacting with your product — buttons that take too long to respond, forms that feel stuck. For SaaS products, this directly impacts user perception of quality and reliability.
How to Fix It
- Minimize main thread work during user interactions by breaking up long tasks.
- Use requestAnimationFrame for visual updates and avoid forced synchronous layouts.
- Optimize event handlers — avoid heavy computation in click and input handlers.
- Consider using Web Workers for computationally expensive operations.
Frequently Asked Questions
What is a good INP score?
SaaSalyst rates INP as pass at 200ms or below (good), warn between 201-500ms (needs improvement), and fail above 500ms (poor), matching Google's Core Web Vitals thresholds.
Why might my INP check not appear?
INP uses Chrome User Experience Report data which requires sufficient real-user traffic. New or low-traffic sites may not have CrUX data. SaaSalyst skips the INP check rather than penalizing you when data is unavailable.
Check Your SaaS Now — Free
SaaSalyst scans your website in 30 seconds and checks for Interaction to Next Paint (INP) along with 40+ other business readiness signals.
Scan Your App