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+# iOS CPU Profiling
+
+XCode has a number of built in profiling tools that can easily be used with local or prebuilt engines. This document is focused on creating flame graph charts, which is not a part of XCode but provides a useful way to look at aggregate performance. Compared to the Android Studio flame graph this one is a little wonky, but still useful.
+
+
+1. Clone the "FlameGraph" swift package from `https://github.com/lennet/FlameGraph`
+2. Start a "Time Profiler" based profile session.
+
+![Alt text](assets/ios_profiling/ios_time_profiler_example.png)
+
+  Click the red dot to begin and record as much profile data as you want, then press stop to conclude the trace.
+
+3. Select the thread to investigate, in this case you want io.flutter.raster. IMPORTANT: also select the trace root.
+
+![Alt text](assets/ios_profiling/ios_profiler_select_thread.png)
+
+4. Copy the trace with the keyboard shortcut (⇧⌘C) or the menu ("Edit" -> "Deep Copy").
+
+![Alt text](assets/ios_profiling/deep_copy.png)
+
+5. On the command line, run `swift run FlameGraph --html output.html`
+
+A new browser tab will open with the flame graph. It may require some zooming to be useful.
+
+![Alt text](assets/ios_profiling/flamegraph.png)
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