Performance audits
Measure performance and find opportunities to speed up page loads.
Overview
These checks ensure that your page is optimized for users to be able to see and interact with page content.
Table of Contents
Performance audit scoring
Metrics
Opportunities
- Eliminate render-blocking resources
- Properly size images
- Defer offscreen images
- Minify CSS
- Minify JavaScript
- Remove unused CSS
- Efficiently encode images
- Serve images in modern formats
- Enable text compression
- Preconnect to required origins
- Reduce server response times (TTFB)
- Avoid multiple page redirects
- Preload key requests
- Use video formats for animated content
- Reduce the impact of third-party code
- Avoid non-composited animations
- Lazy load third-party resources with facades
Diagnostics
- Avoid enormous network payloads
- Serve static assets with an efficient cache policy
- Avoid an excessive DOM size
- Avoid chaining critical requests
- User Timing marks and measures
- Reduce JavaScript execution time
- Minimize main thread work
- Ensure text remains visible during webfont load
- Keep request counts low and transfer sizes small