性能审核
衡量性能并寻找机会加快网页加载速度。
机会
- 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
诊断
- 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