# 性能分析
- 关键性能指标。忽略页面卸载时间、重定向时间。
1. 首包：`responseStart - domainLookupStart`
2. 首次渲染/白屏：`responseEnd - fetchStart`
3. 首次可交互：`domInteractive - fetchStart`
4. DOM Ready：`domContentLoadedEventEnd - fetchStart`
5. 页面加载：`loadEventStart - fetchStart`
- 各阶段指标瀑布流
1. unLoad：`unloadEventEnd - unloadEventStart`
2. Redirect：`redirectEnd - redirectStart`
3. AppCache：`domainLookupStart - fetchStart`
4. DNS：`domainLookupEnd - domainLookupStart`
5. TCP：`connectEnd - connectStart`
6. TTFB：`responseStart - requestStart`
7. 数据传输：`responseEnd - responseStart`
8. DOM：`domContentLoadedEventStart - responseEnd`
9. DCL：`domContentLoadedEventEnd - domContentLoadedEventStart`
10. 资源加载：`loadEventStart - domContentLoadedEventEnd`
11. onLoad：`loadEventEnd - loadEventStart`
- 资源分析
1. 首页资源请求数量、加载大小和域名分布情况。
2. 请求资源域名分布，与各个域名平均耗时。
3. 未设置响应头域名分布情况。
4. http 压缩情况，未压缩分布，缓存命中率。
5. 资源类型情况。
6. 抽样10条最耗时的资源和 ajax 请求。
Extore is a team of professionals who are passionate about creating extensions for web browsers. This devotion also gives us opportunity to appreciate work of other people. We get inspired by useful, open source extensions made by developers all over the world. Our strong belief is that one should share helpful add-ons with others. That’s why we’d like to present you our ever-growing list of favourite extensions that have inspired us. Moreover, as you probably have already learned, sometimes struggling for the best brings an end to the good. Talking about add-ons it often turns out that an upgrade is worse then previous version. Also it can become really tricky to get back to the beloved version of your favourite extension. That’s why we’re going to make not only the latest, but all versions of our favourite (and we hope yours too) add-ons available for download. No more compromises, just stick to the version you really like!
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