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.
What you'll learn
Performance audit scoring
Metrics
- First Contentful Paint
- First Meaningful Paint
- Speed Index
- First CPU Idle
- Time to Interactive
- Max Potential First Input Delay
- Total Blocking Time
Opportunities
- Eliminate render-blocking resources
- Properly size images
- Defer offscreen images
- Minify CSS
- Minify JavaScript
- Remove unused CSS
- Efficiently encode images
- Serve images in next-gen 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
Diagnostics
- Avoid enormous network payloads
- Serve static assets with an efficient cache policy
- Avoid an excessive DOM size
- Minimize critical request depth
- 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