Which metrics make up Core Web Vitals?

Core Web Vitals consists of three metrics, each responsible for its own aspect of user experience:

#1. LCP (Largest Contentful Paint)

Shows how fast the main, largest element appears on screen - for example, a banner, a heading, or an image. Responsible for visual load speed. Target: ≤ 2.5 seconds.

#2. INP (Interaction to Next Paint)

Measures the page's response time to a user's action - a click, a tap, typing. This is a responsiveness metric that shows whether the site feels "alive" or "sluggish". Target: ≤ 200 ms.

#3. CLS (Cumulative Layout Shift)

Evaluates layout stability while the page loads - whether images, text, and buttons jump around, causing the user to tap the wrong spot. Target: ≤ 0.1.

Google considers these three metrics key because they reflect real user experience: how fast content becomes visible, how fast the site responds, and how stable everything is while it loads.