Failing Core Web Vitals? Fix LCP, CLS, and INP in 5 Days.

High LCP typically stems from four root causes: slow server response (TTFB > 800ms), render-blocking resources delaying FCP, unoptimized LCP element (usually a hero image loaded without preload or fetchpriority), or client-side rendering that delays LCP until JavaScript executes. We profile your specific waterfall to identify which combination is at play.

CLS fixes target layout instability sources: we add explicit width and height attributes to all images and iframes, implement font-display: swap with size-adjust to prevent FOUT shifts, use contain-intrinsic-size for lazy-loaded content, pre-allocate space for dynamic elements like ads or injected banners, and replace layout-triggering animations with transform/opacity-based alternatives.

INP (Interaction to Next Paint) officially replaced FID as a Core Web Vital in March 2024. INP measures responsiveness across all interactions during the page lifecycle, not just the first one. This means long tasks that fire on scroll handlers, button clicks, or form submissions all count. We use the Long Animation Frames API and Performance Observer to identify and fix the worst offenders on your specific pages.

Both. Lab data (Lighthouse, WebPageTest) is used during optimization to verify fixes in a controlled environment. Field data (CrUX, RUM) is what Google actually uses for ranking. We validate with lab data first, then monitor CrUX over 28 days to confirm field data reflects the improvements. Your final report includes both.

CrUX data is based on a rolling 28-day window of real user data at the 75th percentile. After deployment, lab data improves immediately. Field data in CrUX typically shows improvement within 14–28 days as the new data replaces old measurements. Search Console's Core Web Vitals report updates accordingly. We monitor this entire cycle and report back.

Yes. Our CWV Enterprise tier includes RUM (Real User Monitoring) integration setup, which gives you continuous field data collection. We can also set up CI/CD performance budgets that block deployments if CWV metrics regress. For ongoing monitoring, we offer monthly plans that include weekly CrUX checks, alerting, and quarterly performance reviews.