Documentation
Everything you need to know about using PageSpeed Insights
Getting Started
Getting started with PageSpeed Insights is super easy. Here's how to run your first analysis:
Enter your URL
Type or paste your website URL in the search box on the homepage.
Click Analyze
Hit the analyze button and wait a few seconds while we check your site.
Review your results
Check out your scores for both mobile and desktop, plus detailed metrics.
Take action
Follow our recommendations to improve your site's performance.
Understanding Results
Your PageSpeed Insights report shows two types of data that help paint a complete picture of your site's performance:
Field Data (Real Users)
Performance data from actual visitors to your site over the past 28 days. This is the most accurate reflection of real-world experience.
Lab Data (Simulated)
Performance data collected in a controlled environment. Great for debugging issues and testing changes.
Metrics Explained
Google uses three Core Web Vitals to measure user experience. Here's what they mean in plain English:
LCP (Largest Contentful Paint)
LCP measures how long it takes for the largest piece of content to appear on screen. Think: the main image or headline on your page.
INP (Interaction to Next Paint)
INP measures how quickly your page responds when someone clicks a button or link. It's all about that snappy feeling.
CLS (Cumulative Layout Shift)
CLS measures how much stuff moves around while the page loads. You know that annoying thing where you try to click something and it jumps? That's what this catches.
Want to learn more about these metrics? Check out our glossary
Score Interpretation
PageSpeed Insights scores range from 0 to 100. Here's what they mean:
Quick Optimization Tips
Here are some common ways to boost your scores:
Optimize Images
Compress images and use modern formats like WebP. This often has the biggest impact on loading speed.
Enable Caching
Use browser caching and consider a CDN like fast.site to serve content from locations closer to your visitors.
Reduce JavaScript
Minimize and defer JavaScript that isn't needed right away. This helps pages become interactive faster.
Prioritize Visible Content
Load the most important content first. Users should see something useful as quickly as possible.