Would you wait 5 seconds for a website to load? Neither will half your mobile visitors.
Performance health measures how fast your website actually loads, how quickly it becomes usable, and how well it behaves on the mobile devices most of your customers are using. Google measures this through Core Web Vitals — a set of technical benchmarks that directly affect both your search rankings and your conversion rates.
Google's own data shows bounce rate probability jumps 32% when a mobile page load time goes from 1 to 3 seconds, and 90% when it hits 5 seconds. That is not a marketing statistic — that is customers leaving your site before they even see it. Performance is one of the highest-ROI pillars to fix because the payoff is immediate and measurable.
Google's three primary performance metrics: LCP (Largest Contentful Paint), INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift).
Real-world load time on a typical mobile device on a typical connection. This is what your customers actually experience.
Whether your images are properly compressed, correctly sized, and using modern formats (WebP, AVIF). Un-optimized images are the #1 speed killer we find.
CSS and JavaScript files that delay your page from being visible. Nearly every small business site has fixable render-blocking problems.
How fast your server responds. If TTFB is bad, everything else is downstream of a hosting or backend problem.
Any business where most traffic is mobile, any e-commerce site, any local business (mobile-heavy audience), and any site that has ever heard "your site feels slow" from a customer.
How to start: Every Performance Health diagnostic is in our Free Website Health Checkup — pick 6 and see your first report in under a minute. Or grab a bundle from $27, or the full Comprehensive Audit ($500).
Free Website Health Checkup. Pick any 6 of 30 diagnostics. Real report in under 60 seconds — no credit card, no upsell wall.
Start My Free Scan →