Web performance is the speed at which a web page loads and responds. It directly affects conversion: every extra second of delay reduces conversions by ~7%. Google uses Core Web Vitals in its ranking algorithm.
Core Web Vitals (Google)
LCP (Largest Contentful Paint) — time to render the largest element. Target: < 2.5 s
INP (Interaction to Next Paint) — response time to user interaction. Target: < 200 ms