In 2021, Google incorporated a set of user experience metrics called Core Web Vitals into its ranking algorithm. If you have a website and you haven't heard of Core Web Vitals, you may have a performance problem that's quietly costing you search rankings — and you don't know it.
What Core Web Vitals Measures
Core Web Vitals consists of three specific metrics that measure different aspects of how pages load and respond to users:
Largest Contentful Paint (LCP): How long it takes for the largest visible element (usually a hero image or main heading) to load. Good: under 2.5 seconds. Needs Improvement: 2.5–4 seconds. Poor: over 4 seconds.
First Input Delay (FID) / Interaction to Next Paint (INP): How quickly a page responds to a user's first interaction (tap, click). Google replaced FID with INP (Interaction to Next Paint) in 2024, which measures all interactions, not just the first. Good: under 200ms.
Cumulative Layout Shift (CLS): How much visible content unexpectedly moves as the page loads (for example, a button that shifts down when an image loads above it, causing accidental taps). Good: under 0.1.
Why This Matters for Your Business
Google uses Core Web Vitals as a ranking signal. Pages that pass all three thresholds (Good) have an advantage over pages that fail one or more. In competitive local markets, this advantage can mean the difference between ranking on page one or page two.
Beyond rankings, Core Web Vitals are fundamentally user experience measures. A page with a poor LCP is a page that keeps users staring at a blank screen. A page with poor CLS is a page where users accidentally tap the wrong thing. These aren't abstract engineering problems — they're direct causes of lost customers.
How to Check and Improve Your Core Web Vitals
Check: Google PageSpeed Insights (pagespeed.web.dev) provides Core Web Vitals data for any page, showing both lab data (simulated) and field data (real user experiences).
Common improvements:
- Optimize and properly size images (the #1 fix for poor LCP)
- Upgrade to quality hosting with fast server response times
- Reduce JavaScript execution time
- Reserve space for images in CSS to prevent CLS
- Use modern image formats (WebP)
Build a Website That Passes Every Performance Test
Contact Linear Web Solutions — our websites are built to meet or exceed Core Web Vitals thresholds, giving you both better rankings and better user experiences.
