12 May 2026 · 8 min
Core Web Vitals rarely win a competitive keyword on their own, but poor ones quietly cap everything else you do — including conversion rate.
The three metrics that matter
LCP measures how fast the main content appears. Aim under 2.5 seconds on mobile 4G, not on your office fibre.
INP measures responsiveness to interaction. Heavy third-party scripts are the usual culprit.
CLS measures layout stability. Reserve space for images, ads and embeds and it largely solves itself.
Fixes ranked by impact
Serve correctly sized modern images with explicit dimensions and lazy loading below the fold.
Remove or defer non-critical third-party scripts — chat widgets, heat maps and duplicate tag managers.
Preload the hero image and primary font, and self-host or preconnect fonts.
Cache aggressively at the edge and cut render-blocking CSS.
Measuring honestly
Use field data in Search Console as the source of truth; lab tools are for diagnosis only.
Re-test after every deployment. Speed regressions arrive with new plugins and tracking, not with content.
Key takeaways
- — Field data beats lab scores for decision making.
- — Images and third-party scripts cause most failures.
- — Speed work protects conversion rate as much as rankings.