Interaction to Next Paint replaced FID. Here is what failed first on the sites we monitor.
When INP replaced First Input Delay, a lot of green dashboards turned amber overnight. We looked at the sites we monitor to see what was behind it.
The usual suspects
- Cookie banners that run heavy scripts on click
- Menus that rebuild the whole header
- Filters that re-render every product card
INP punishes work done at the moment of the click, not work done on load.
Takeaways
Move work out of click handlers, split long tasks, and test on a mid-range phone, not a laptop.
