Learn how to measure, analyze, and improve performance metrics that matter to users and search engines
Practical guides for Edmonton developers who want faster websites
LCP measures when the largest element appears on screen. We'll show you how to identify what's slowing yours down and fix it quickly.
CLS happens when page elements move unexpectedly while users interact. This guide shows exactly where to look and how to prevent it without rebuilding your site.
FID (now Interaction to Next Paint) measures how quickly your site responds to user clicks. Learn what causes delays and the fastest ways to fix them.
PageSpeed Insights, Lighthouse, and WebPageTest all tell different stories. We'll break down which tools to trust and how to act on what they're telling you.
Quick lookup for metric thresholds and what they mean for your site
| Metric | Good | Needs Work | Poor |
|---|---|---|---|
| LCP (Largest Contentful Paint) | 2.5s | 2.5s - 4.0s | > 4.0s |
| FID (First Input Delay) | 100ms | 100ms - 300ms | > 300ms |
| CLS (Cumulative Layout Shift) | 0.1 | 0.1 - 0.25 | > 0.25 |
| TTFB (Time to First Byte) | 600ms | 600ms - 1.8s | > 1.8s |
| INP (Interaction to Next Paint) | 200ms | 200ms - 500ms | > 500ms |
These thresholds are based on Google's official Core Web Vitals criteria. Most of these metrics are measured on real user data (RUM) and aren't just lab measurements. If you're consistently in the "Good" range across your pages, you're doing well.
