Core Web Vitals are Google's three metrics for how fast and stable a page feels to real users.
They are part of how Google ranks pages, and they affect whether visitors stay or bounce. All three are measurable and fixable.
The three metrics
- LCP. How fast the main content loads. Aim under 2.5 seconds.
- INP. How quickly the page responds to a tap or click.
- CLS. How much the layout shifts as it loads. Less is better.
How to improve them
- Compress images and lazy-load below-the-fold media.
- Reduce heavy scripts that block interaction.
- Set size attributes so elements do not jump around.
Quick tip: Run PageSpeed Insights for your exact scores and a prioritised list of what to fix first.
Thresholds come from Google's Web Vitals guidance.
Frequently asked questions
What are the three Core Web Vitals?
LCP (how fast the main content loads), INP (how quickly the page responds to input) and CLS (how stable the layout is as it loads).
Are Core Web Vitals a ranking factor?
Yes, they are part of how Google ranks pages, and they affect whether visitors stay or bounce.
How do I measure Core Web Vitals?
Run PageSpeed Insights for your scores and a prioritised list of fixes, then re-test after changes to confirm they moved.