Core Web Vitals are the three core metrics Google uses to measure user experience: LCP, INP and CLS.
LCP (Largest Contentful Paint)
The load time of the largest piece of content in the visible viewport. Target: under 2.5 seconds. Improve it with image lazy loading, CSS critical path optimization, and faster server response times.
INP (Interaction to Next Paint)
The time from a user’s first interaction to the screen updating. It replaced FID. Target: under 200ms. Lower it with JavaScript optimization and third-party script minimization.
CLS (Cumulative Layout Shift)
Unexpected layout shifts that occur while a page loads. Target: under 0.1. Fix it by setting width/height on images, using font-display: swap, and reserving fixed space for dynamic content.
Every site we deliver passes all three metrics — it’s written into the contract.