Google's Core Web Vitals directly affect how your pages feel to users, and they are part of the page experience signals used in search. Here is a practical checklist we use when auditing sites.

The three metrics and their "good" thresholds

  • LCP (Largest Contentful Paint): 2.5 seconds or less
  • INP (Interaction to Next Paint): 200 milliseconds or less
  • CLS (Cumulative Layout Shift): 0.1 or less

Measure them on real devices with PageSpeed Insights, the Chrome UX Report, and Lighthouse. Field data matters more than lab scores.

1. Fixing LCP

  • Serve the hero image in WebP or AVIF and set explicit width and height.
  • Preload the LCP image and critical fonts: 
<link rel="preload" as="image" href="/hero.webp" fetchpriority="high">
  • Inline critical CSS and defer the rest.
  • Use a CDN and server-side caching to reduce time to first byte.

2. Fixing INP

  • Break up long JavaScript tasks (anything over 50ms) with setTimeout or scheduler.yield().
  • Remove unused third-party scripts. Chat widgets and tag managers are common offenders.
  • Debounce expensive input handlers and avoid heavy work on the main thread.

3. Fixing CLS

  • Always reserve space for images, ads and embeds.
  • Use font-display: swap with a well-matched fallback font.
  • Never inject content above existing content after load.

A quick workflow

  1. Run PageSpeed Insights on your top 5 landing pages.
  2. Fix the worst metric first, usually LCP.
  3. Re-test after each change and track field data for 28 days.

Final thoughts

Performance is not a one-time task. Small, measured improvements compound into better rankings, lower bounce rates and higher conversions.

If you want a team to handle performance, custom web apps or technical SEO for you, take a look at DiginixIT, a web engineering and digital growth agency in Pakistan.