如何理解Documenting a startup optimization？

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标准回答

The startup path was divided into measurable stages. Perfetto was used to inspect main-thread work, UI creation, and initialization dependencies. The analysis identified which tasks were required before the first useful response and which could run later.

The changes included asynchronous layout inflation, background work for suitable tasks, on-demand views, and deferred non-critical initialization. The recorded project-defined response time changed from 380 to 240 milliseconds, while completion time changed from 1,200 to 700 milliseconds. These metrics require their own start and end definitions and are not automatically equivalent to TTID and TTFD.

中文说明：measurable stages 表示可测量的阶段；required before the first useful response 描述首个有效响应前的必要依赖。使用 project-defined 明确案例计时规范，避免翻译时改变指标含义。

追问与回答

Moving work off the main thread

Background execution does not guarantee lower latency. The UI may still depend on the result, and background tasks may compete for CPU or I/O. Always check the end-to-end critical path. 后台执行仍需检查依赖和资源竞争。

内容来源

• Android 与 AI 工程 Wiki · 原条目 q100