What Slow Pages Are Actually Costing You
Core Web Vitals for any public URL, measured through Google's own data — plus the fixes ranked by likely revenue impact rather than by how easy they are.
Fixes ranked by impact
- High
Serve modern image formats at the right size
Usually the single largest LCP win. AVIF/WebP, correct dimensions, and a priority hint on the hero image.
- High
Audit third-party scripts
Chat widgets, heatmaps and tag managers frequently cost more than all your own JavaScript combined.
- Medium
Preload and subset fonts
Preload the display face, subset to the characters you use, and set font-display: swap.
- Medium
Defer non-critical CSS and JS
Anything not needed for first paint should not block it.
- Medium
Reserve space for media
Explicit width and height on images and embeds eliminates most layout shift.
- Low
Enable edge caching
A CDN in front of static assets cuts TTFB for visitors far from your origin.
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Results come from Google's Chrome UX Report where field data exists for the URL, and from a lab run where it does not. Field data reflects real visitors on real networks; lab data is a simulation and tends to be optimistic.
Across the sites we have measured, every additional second of LCP correlates with roughly a 7–12% drop in conversion rate. On a store doing $200,000 a month, that is not an engineering detail.
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