Metrics

Largest Contentful Paint measures how long it takes for your main content to appear. Learn what LCP is, what Google considers good, and what causes it to be slow.

Interaction to Next Paint measures how quickly your site responds to clicks and taps. Learn what INP is, what a good score looks like, and what makes it slow.

Cumulative Layout Shift measures how much your page jumps around while loading. Learn what CLS is, why it frustrates visitors, and what causes layout instability.

Time to First Byte measures how fast your server starts responding. Learn what TTFB is, what a good score looks like, and how it affects every other metric.

Your PageSpeed score and your Search Console data measure different things. Learn the difference between field data and lab data, and why field data is what matters for SEO.

Google uses real visitor data from Chrome browsers to evaluate your site speed for search rankings. Learn how CrUX data works and what the 75th percentile means.

A good PageSpeed score does not mean your site passes Core Web Vitals. Learn why lab tests and field data diverge and which one determines your search rankings.

Google’s Page Experience update made Core Web Vitals a ranking signal. Learn what this means for your search visibility and why field data performance affects your SEO.

Faster sites convert better — this is measurable and well-documented. Learn how page load time affects bounce rate, conversion rate, and revenue on e-commerce sites.

Most Core Web Vitals failures happen on mobile devices where processors are slower and connections are weaker. Learn why mobile performance matters more and why your desktop score is misleading.

The total size of everything your page loads — HTML, CSS, JavaScript, images, and fonts — directly affects how fast it appears. Learn what a healthy page weight looks like.

A performance budget sets limits on page weight, script count, and load time to keep your site fast as it grows. Learn what performance budgets are and why they matter.

Core Web Vitals are the three metrics Google uses to measure your site real-world user experience. Learn what they are, why they matter for SEO, and how they are measured.