[完成翻译] src/perf/faq.md

src/perf/faq.md

@@ -1,34 +1,63 @@
 ---
 title: Performance FAQ
+title: 性能常见问题和回答
 description: Frequently asked questions about Flutter performance
+description: 关于 Flutter 性能的常见问题
 ---
 
 This page collects some frequently asked questions
 about evaluating and debugging Flutter's performance.
 
+本篇收集了一些关于评估和调试 Flutter 性能的常见问题。
+
 * Which performance dashboards have metrics that are related to Flutter?
+
+  哪些性能仪表盘有 Flutter 相关的指标？
+
   * [Flutter dashboard on appspot][]
+
+    [在 Appspot 上的 Flutter 仪表盘][Flutter dashboard on appspot]
+
   * [Flutter Skia dashboard][]
+
+    [Flutter Skia 仪表盘][Flutter Skia dashboard]
+
   * [Flutter Engine Skia dashboard][]
 
+    [Flutter Engine Skia 仪表盘][Flutter Engine Skia dashboard]
+
 [Flutter dashboard on appspot]: https://flutter-dashboard.appspot.com/
 [Flutter engine Skia dashboard]: https://flutter-engine-perf.skia.org/t/?subset=regressions
 [Flutter Skia dashboard]: https://flutter-flutter-perf.skia.org/t/?subset=regressions
 
 * How do I add a benchmark to Flutter?
+
+  我如何向 Flutter 添加一个基准测试？
+
   * [How to write a render speed test for Flutter][speed-test]
+
+    [如何编写 Flutter 的渲染速度测试][speed-test]
+
   * [How to write a memory test for Flutter][memory-test]
 
+    [如何编写 Flutter 的内存测试][memory-test]
+
 [memory-test]: {{site.repo.flutter}}/wiki/How-to-write-a-memory-test-for-Flutter
 [speed-test]: {{site.repo.flutter}}/wiki/How-to-write-a-render-speed-test-for-Flutter
 
 * What are some tools for capturing and analyzing performance
   metrics?
+
+  有哪些捕捉和分析性能指标的工具？
+
   * [Dart DevTools]({{site.url}}/tools/devtools)
   * [Apple instruments](https://en.wikipedia.org/wiki/Instruments_(software))
   * [Linux perf](https://en.wikipedia.org/wiki/Perf_(Linux))
   * [Chrome tracing (enter `about:tracing` in your
     Chrome URL field)][tracing]
+
+    [Chrome tracing（在浏览器地址栏输入 `about:tracing`）][tracing]
+
   * [Android systrace (`adb systrace`)][systrace]
   * [Fuchsia `fx traceutil`][traceutil]
   * [Perfetto](https://ui.perfetto.dev/)
@@ -39,17 +68,32 @@ about evaluating and debugging Flutter's performance.
 [traceutil]: https://fuchsia.dev/fuchsia-src/development/tracing/usage-guide
 
 * My Flutter app looks janky or stutters. How do I fix it?
+
+  我的 Flutter 应用程序很卡顿，性能很糟糕。
+  我怎么样才能修复这些问题？
+
   * [Improving rendering performance][]
 
+    [提高渲染性能][Improving rendering performance]
+
 [Improving rendering performance]: {{site.url}}/perf/rendering-performance
 
 * What are some costly performance operations that I need
   to be careful with?
+
+  有哪些特别消耗性能的操作是我需要注意的？
+
   * [`Opacity`][], [`Clip.antiAliasWithSaveLayer`][],
-     or anything that triggers [`saveLayer`][]
+    or anything that triggers [`saveLayer`][]
+
+    [`Opacity`][]、[`Clip.antiAliasWithSaveLayer`][] 
+    或任何能触发 [`saveLayer`][] 的操作。
+
   * [`ImageFilter`][]
   * Also see [Performance best practices][]
 
+    查阅 [性能优化最佳实践][Performance best practices]
+
 [`Clip.antiAliasWithSaveLayer`]: {{site.api}}/flutter/dart-ui/Clip.html#antiAliasWithSaveLayer
 [`ImageFilter`]: {{site.api}}/flutter/dart-ui/ImageFilter-class.html
 [`Opacity`]: {{site.api}}/flutter/widgets/Opacity-class.html
@@ -58,61 +102,121 @@ about evaluating and debugging Flutter's performance.
 
 * How do I tell which widgets in my Flutter app are rebuilt
   in each frame?
+
+  我如何才能知道 Flutter 应用程序中哪些 widget 在哪一帧中被重新构建？
+
   * Set [`debugProfileBuildsEnabled`][] true in
     [widgets/debug.dart][debug.dart].
+
+    将 [widgets/debug.dart][debug.dart] 
+    中的 [`debugProfileBuildsEnabled`][] 设置为 true。
+
   * Alternatively, change the `performRebuild` function in
     [widgets/framework.dart][framework.dart] to ignore
     `debugProfileBuildsEnabled` and always call
     `Timeline.startSync(...)/finish`.
+
+    或者，改变 [widgets/framework.dart][framework.dart] 中的
+    `performRebuild` 函数，忽略 `debugProfileBuildsEnabled`，
+    并始终调用 `Timeline.startSync(...)/finish`。
+
   * If you use IntelliJ, a GUI view of this data is available.
-    Select **show widget rebuild information**,
-    and you'll visually see which widgets rebuild
-    visually in your IDE.
+    Select **Track widget rebuilds**,
+    and your IDE displays which the widgets rebuild.
+
+    如果你使用 IntelliJ，就可以看见这些数据的 GUI 视图。
+    在 IntelliJ 的 Flutter Performance 工具中
+    勾选 **Track widget rebuilds**，
+    你就能在 IDE 中直观地看见哪些 widget 进行了重建。
 
 [`debugProfileBuildsEnabled`]: {{site.api}}/flutter/widgets/debugProfileBuildsEnabled.html
 [debug.dart]: {{site.repo.flutter}}/blob/master/packages/flutter/lib/src/widgets/debug.dart
 [framework.dart]: {{site.repo.flutter}}/blob/master/packages/flutter/lib/src/widgets/framework.dart
 
 * How do I query the target frames per second (of the display)?
+
+  我如何查询显示器的刷新率？
+
   * [Get the display refresh rate][]
 
+    [获取显示器刷新率][Get the display refresh rate]
+
 [Get the display refresh rate]: {{site.repo.flutter}}/wiki/Engine-specific-Service-Protocol-extensions#get-the-display-refresh-rate-_fluttergetdisplayrefreshrate
 
 * How to solve my app’s poor animations caused by an expensive
   Dart async function call that is blocking the UI thread?
+
+  如何解决我的应用程序因高消耗的 Dart 异步函数调用
+  阻塞了 UI 线程，而导致动画效果不佳？
+
   * Spawn another isolate using the [`compute()`][] method,
     as demonstrated in [Parse JSON in the background][] cookbook.
 
+    使用 [`compute()`][] 方法生成另一个 isolate，
+    例如 [在后台处理 JSON 数据解析][Parse JSON in the background] 实用教程 (Cookbook) 中所演示的。
+
 [`compute()`]: {{site.api}}/flutter/foundation/compute-constant.html
 [Parse JSON in the background]: {{site.url}}/cookbook/networking/background-parsing
 
 * How do I determine my Flutter app’s package size that a
   user will download?
+
+  我如何确定用户下载的 Flutter 应用程序包的体积？
+
   * See [Measuring your app's size][]
 
+    请查阅 [测量你的应用体积][Measuring your app's size]
+
 [Measuring your app's size]: {{site.url}}/perf/app-size
 
 * How do I see the breakdown of the Flutter engine size?
+
+  我如何才能看到 Flutter engine 内架构细分的体积？
+
   * Visit the [binary size dashboard][], and replace the git
     hash in the URL with a recent commit hash from
     [GitHub engine repository commits][].
 
+    访问 [binary size dashboard][]，
+    用 [GitHub 上 engine 仓库][GitHub engine repository commits] 最近提交的 hash 值替换 URL 中的 hash 值。
+
 [binary size dashboard]: https://storage.flutter-io.cn/flutter_infra_release/flutter/241c87ad800beeab545ab867354d4683d5bfb6ce/android-arm-release/sizes/index.html
 [GitHub engine repository commits]: {{site.github}}/flutter/engine/commits
 
 * How can I take a screenshot of an app that is running and export it
   as a SKP file?
+
+  我如何才能对正在运行的应用程序进行截图，
+  并将其导出 SKP 文件？
+
   * Run `flutter screenshot --type=skia --observatory-uri=...`
+
+    运行 `flutter screenshot --type=skia --observatory-uri=...` 命令
+
   * Note a known issue viewing screenshots:
+
+    注意，一个查看截图的已知问题：
+
     * [Issue 21237][]: Doesn’t record images in real devices.
+
+      [Issue 21237][]: 无法在真机中截图。
+
   * To analyze and visualize the SKP file,
     check out the [Skia WASM debugger][].
 
+    分析和可视化 SKP 文件，请使用 [Skia WASM debugger][]。
+
 [Issue 21237]: {{site.repo.flutter}}/issues/21237
 [Skia WASM debugger]: https://debugger.skia.org/
 
 * How do I retrieve the shader persistent cache from a device?
+
+  如何从设备上读取着色器持久化缓存？
+
   * On Android, you can do the following:
+
+    在 Android 上，你可以进行以下操作：
+
     ```terminal
     adb shell
     run-as <com.your_app_package_name>
@@ -121,4 +225,9 @@ about evaluating and debugging Flutter's performance.
     ```
 
 * How do I perform a trace in Fuchsia?
+
+  我如何在 Fuchsia 中进行追踪？
+
   * See [Fuchsia tracing guidelines][traceutil]
+
+    请查阅 [Fuchsia 追踪指南][traceutil]