前端性能核对表Checklist-2018
1. 计划与度量 Get Ready: Planning and Metrics
☐ Establish a performance culture.
☐ Choose the right metrics.
☐ Be 20% faster than your fastest competitor.
☐ Share the checklist with your colleagues.
2. 设置务实的目标 Setting Realistic Goals
☐ 100-millisecond response time, 60 frames per second
☐ SpeedIndex < 1250, Time-To-Interactive < 5s on 3G.
☐ Critical payload chunk = 15Kb, critical file size budget < 170Kb
3.环境定义 Defining the Environment
☐ Choose and set up your build tools.
☐ Progressive enhancement.
☐ Choose a strong performance baseline.
☐ Will you be using AMP or Instant Articles?
☐ Choose your CDN wisely.
4. 构建优化 Build Optimizations
☐ Set your priorities right.
☐ Consider the “cutting-the-mustard” technique.
☐ Parsing JavaScript is expensive, so keep it small.
☐ Use tree-shaking and code-splitting to reduce payloads.
☐ Do you constrain the impact of third-party scripts?
☐ Are HTTP cache headers set properly?
5. 资产优化 Assets Optimizations
☐ Is Brotli or Zopfli text compression in use?
☐ Are images properly optimized?
☐ Are web fonts optimized?
6. 交付优化 Delivery Optimizations
☐ Push critical CSS quickly.
☐ Using babel-preset-env to only transpile ES2015+ features.
☐ Improve rendering performance.
☐ Lazy-load expensive scripts with Intersection Observer.
☐ Have you optimized rendering experience?
☐ Warm up the connection to speed up delivery.
7. HTTP/2
☐ Get ready for HTTP/2.
☐ Properly deploy HTTP/2.
☐ Are you saving data with Save-Data?
☐ Make sure the security on your server is bulletproof.
☐ Do your servers and CDNs support HTTP/2?
☐ Is OCSP stapling enabled?
☐ Have you adopted IPv6 yet?
☐ Is HPACK compression in use?
☐ Are service workers being used for caching and network fallbacks?
8. 测试与监控 Testing and Monitoring
☐ Monitor mixed-content warnings.
☐ Is your development workflow in DevTools optimized?
☐ Have you tested in proxy browsers and legacy browsers?
☐ Is continuous monitoring set up?
9. 快既赢 Quick wins
1. Measure the real world experience and set appropriate goals. A good goal to aim for is First Meaningful Paint < 1 s, a SpeedIndex value < 1250, Time to Interactive < 5s on slow 3G, for repeat visits, TTI < 2s. Optimize for start rendering time and time-to-interactive.
2. Prepare critical CSS for your main templates, and include it in the <head> of the page. (You budget is 14 KB.) For CSS/JS, operate within a critical file size budget of max. 170Kb gzipped (0.8-1Mb decompressed).
3. Defer and lazy-load as many scripts as possible, both your own and third-party scripts — especially social media buttons, video players and expensive JavaScript.
4. Add resource hints to speed up delivery with faster dns-lookup, preconnect, prefetch and prelo
5. Subset web fonts, and load them asynchronously (or just switch to system fonts instead).
6. Optimize images, and consider using WebP for critical pages (such as landing pages).
7. Check that HTTP cache headers and security headers are set properly.
8. Enable Brotli or Zopfli compression on the server. (If that’s not possible, don’t forget to enable Gzip compression.)
9. If HTTP/2 is available, enable HPACK compression, and start monitoring mixed-content warnings. If you’re running over LTS, also enable OCSP stapling.
10. If possible, cache assets such as fonts, styles, JavaScript and images — actually, as much as possible! — in a service worker cache.
相关LINK:
AMP https://www.ampproject.org/
instant articles https://instantarticles.fb.com/
Brotli https://en.wikipedia.org/wiki/Brotli
OCSP https://www.digicert.com/enabling-ocsp-stapling.htm
如何处理设计与性能开销之间的关系（guide on how to approach designs with a performance budget）
性能开销（performance budgets）
性能监控
PWMetrics ， Calibre ， SpeedCurve ， mPulse ， Boomerang ， Sitespeed.io
cutting-the-mustard 技术
ahead-of-time compiler(编译器)
Tree-shaking scope hoisting
Heroku’s primer on HTTP caching headers、缓存之最佳实践 HTTP caching primer
Pragmatist's Guide to Service Workers
BrowserStack
性能回归自动报警（automated performance regression alerts）
WebPageTest
k6 SpeedTracker、Lighthouse 以及 Calibre
安全
仔细检查那些与安全相关的 HTTP 头部，看是否设置正确
使用一些工具来排除已知漏洞
使用一些网站来检查证书是否失效
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