Core Web Vitals are Google’s measurements of real-world page experience: how fast the main content loads, how responsive the page feels and how stable the layout is. They are part of Google’s page experience signals, and they correlate with happier visitors and better conversions. Here is what each means and how to improve them in WordPress.
The three Core Web Vitals
| Metric | Measures | Good score |
|---|---|---|
| LCP (Largest Contentful Paint) | How quickly the main content appears | 2.5 seconds or less |
| INP (Interaction to Next Paint) | How quickly the page responds to taps and clicks | 200 milliseconds or less |
| CLS (Cumulative Layout Shift) | How much the layout jumps while loading | 0.1 or less |
INP replaced First Input Delay (FID) as a Core Web Vital in March 2024.
How to test them
- PageSpeed Insights: shows real-user (field) data when available, plus lab data.
- Google Search Console: the Core Web Vitals report groups URLs that need work.
- Chrome DevTools and Lighthouse: for lab testing.
Field data from real users matters most. Lab tests are for diagnosing.
Improve LCP
- Use fast hosting and caching.
- Optimize and properly size your hero image. Do not lazy-load it.
- Reduce render-blocking CSS and JavaScript.
- Preload important fonts and the hero image where appropriate.
Details: how to fix LCP in WordPress.
Improve INP
- Reduce heavy JavaScript and third-party scripts.
- Break up long tasks.
- Avoid large DOM sizes.
Details: how to fix INP in WordPress.
Improve CLS
- Set width and height on images and embeds.
- Reserve space for ads and popups.
- Avoid inserting content above existing content.
- Load fonts without large layout changes.
Details: how to fix CLS in WordPress.
Why your builder matters
Page builders that add many wrapper elements and scripts to every page make good scores harder. Builders that output lean HTML and load scripts only where used, like Tuli Builder, start you in a better position. See lightweight WordPress page builders.
General fixes: how to speed up WordPress.
FAQ
Do Core Web Vitals affect rankings?
They are one of many signals. Great content still matters most, but poor experience hurts engagement.
Do I need all green scores?
Aim for good scores on your key pages, but do not sacrifice usability for a perfect number.