In 2025, Core Web Vitals are a confirmed Google ranking factor. Websites with poor scores see measurable ranking drops. Here's the technical guide to get your LCP, CLS, and INP into the "Good" range — and how we scored 100/100 on PageSpeed for multiple client sites.
The Three Core Web Vitals Explained
- LCP (Largest Contentful Paint): How quickly your largest above-the-fold element loads. Target: under 2.5s
- CLS (Cumulative Layout Shift): How much your page layout shifts unexpectedly. Target: under 0.1
- INP (Interaction to Next Paint): How fast your page responds to user interactions. Target: under 200ms
How to Fix LCP (Largest Contentful Paint)
LCP is almost always your hero image or H1 heading. The fixes:
- Add
priorityto your heronext/imagecomponent - Preload your LCP image with
<link rel="preload"> - Use AVIF or WebP format (50–70% smaller than JPEG)
- Serve images from a CDN (Vercel, Cloudflare, or CloudFront)
- Reduce server response time — use Vercel Edge Functions or cache your pages
- Remove render-blocking CSS and JavaScript
The single biggest LCP win we see: switching from unoptimized PNG hero images to WebP with proper preloading. Average LCP improvement: 1.8 seconds.
How to Fix CLS (Cumulative Layout Shift)
- Always set explicit width/height on images and video elements
- Reserve space for ads and embeds with CSS aspect-ratio
- Avoid inserting content above existing content (popups, banners)
- Use
font-display: optionalfor web fonts to avoid FOUT (Flash of Unstyled Text) - Preload critical fonts in your
<head>
How to Fix INP (Interaction to Next Paint)
- Reduce JavaScript bundle size — code split with dynamic imports
- Move heavy computations to Web Workers
- Debounce and throttle event handlers
- Defer non-critical third-party scripts (chat widgets, analytics)
- Use React
useTransitionfor non-urgent state updates
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