Web 性能分析 Chrome extension icon

Web 性能分析

👥 577 users
📦 v1.1
💾 422KiB
📅 2025-02-14
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Overview

# 性能分析

使用 Performance API 处理数据可视化,本地使用本地展示,不会远程收集用户任何数据,展示数据也不会对当前网页造成任何破坏。

- 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. 显示资源加载和 ajax 请求耗时。

Tags

Productivity/developer productivity/developer

Privacy Practices

Not being sold to third parties, outside of the approved use cases
Not being used or transferred for purposes that are unrelated to the item's core functionality
Not being used or transferred to determine creditworthiness or for lending purposes

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