Core Web Vitals: Why They Matter for Your SEO Rankings
Google officially uses Core Web Vitals as a ranking factor. If your scores are poor, you are losing positions to technically weaker competitors with better performance. Here is how to fix it.
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LCP: Fix Your Largest Element First
LCP measures how quickly the largest visible element loads. The most common LCP culprits are unoptimised hero images, render-blocking JavaScript, and slow server response times — all fixable with the right hosting and build configuration.
INP: Responsiveness Under the Microscope
INP replaced FID in March 2024 and measures the worst interaction latency throughout an entire page visit. Long JavaScript tasks on the main thread are the primary cause — code-split aggressively, defer non-critical scripts, and use Web Workers for heavy computations.
CLS: Stop Your Layout Jumping
CLS measures visual instability caused by elements shifting after initial render. Always specify explicit width and height attributes on images and video, avoid inserting content above existing content, and ensure web fonts load without layout shifts.
Measure with Real User Data
CrUX data, which feeds Search Console's Core Web Vitals report, measures real users on real devices and networks. Optimise for the 75th percentile of real users — not your fast development machine on a fibre connection.
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