Core Web Vitals remain one of the few confirmed Google ranking factors with a direct, measurable connection to user experience. Yet most sites we audit are still failing at least one metric — often without the team realising it.
The three metrics that matter
- Largest Contentful Paint (LCP): how quickly the main content becomes visible — target under 2.5 seconds
- Cumulative Layout Shift (CLS): how much visual elements move around as the page loads — target under 0.1
- Interaction to Next Paint (INP): how responsive the page feels to clicks and taps — target under 200 milliseconds
The fixes that actually move the needle
Most Core Web Vitals advice online focuses on generic tips like "compress your images." Useful, but rarely enough on its own. The fixes that produce measurable change tend to be more specific.
For LCP, the biggest wins usually come from eliminating render-blocking resources above the fold and properly preloading the hero image or video. Generic lazy-loading plugins often make LCP worse, not better, because they delay the very content Google is measuring.
For CLS, the most common offender is ads or embeds that load without a reserved space, pushing content down after the page already appears loaded. Setting explicit width and height attributes on every image and embed eliminates the vast majority of CLS issues.
For INP, heavy JavaScript execution on click handlers is the usual culprit. Breaking up long tasks and deferring non-critical scripts until after the main thread is free typically resolves this without a full rebuild.
We have never seen a Core Web Vitals fix alone cause a ranking jump. But we have never seen a client move up significantly while failing all three metrics, either.
VisionVant Technical TeamOur audit checklist
Every technical audit we run starts with PageSpeed Insights and Chrome DevTools to identify the specific resources causing each failure — not just the score itself. The score tells you there is a problem; the waterfall tells you what to fix.