Table of Contents
What LCP, CLS, and INP actually measure, and the handful of fixes that move them most.
The three metrics in plain English
LCP is how fast the biggest thing on screen shows up. CLS is how much the page jumps around while it loads. INP is how quickly the page responds when you tap or click. Google treats all three as ranking inputs, but more importantly, they are what make a site feel good to use.
The fixes that move the needle
Most wins come from a short list: serve right-sized images in modern formats, reserve space for anything that loads late so nothing shifts, and keep heavy scripts off the main thread. You rarely need a rebuild. You need the few changes that matter.
Measure on real devices
Lab scores are a starting point. Field data from real visitors is the truth. Watch both, fix the worst offender, and re-measure.
