Google measures 3 numbers on your site — LCP, INP and CLS — and has used them as an official ranking factor since 2021. If your site fails them, you're losing sales you didn't even know existed.
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Those are Google's official thresholds. Any number above them is considered "poor" and penalizes your search ranking.
The real impact on sales (documented cases)
- Vodafone — improved LCP by 31% → +8% in sales.
- Rakuten 24 — optimized Core Web Vitals → +33% conversions, −15% bounce rate.
- Renault — reduced LCP by 0.8s → +14% conversions.
Why your go-to WordPress person can't fix this
Fixing Core Web Vitals isn't "install a cache plugin". It involves interdependent technical decisions:
- Choosing the right image format and
fetchpriorityfor the hero (fixing LCP breaks INP if done wrong). - Auditing every third-party script (chat, analytics, pixels) and deciding what stays, what defers, what gets removed.
- Setting up critical font preloads and reserved dimensions to prevent CLS.
- Migrating to hosting with TTFB <600ms — no frontend fix can save a slow host.
- Measuring with real Chrome UX Report data, not the local Lighthouse that always shows green.
90% of SMB WordPress sites fail INP due to third-party scripts blocking the main thread. A developer without performance experience doesn't even know how to detect it.
What we do on every site
At WebCreation GDL we deliver every site with Core Web Vitals in the green from day one. In maintenance, we audit the Chrome UX report, prioritize fixes by impact, and track improvements in Search Console month by month.
Request your free technical audit — we run your URL through PageSpeed Insights and Search Console, send you a diagnosis with the 3 highest-impact fixes and what it costs to fix them. No commitment.