flutter/.github/ISSUE_TEMPLATE/performance_speed.md
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---
name: My app is slow or missing frames.
about: You are writing an application but have discovered that it is slow, you are
not hitting 60Hz, or you are getting jank (missed frames).
title: ''
labels: 'created via performance template'
assignees: ''
---
<!-- Thank you for using Flutter!
If you are looking for support, please check out our documentation
or consider asking a question on Stack Overflow:
* https://flutter.dev/
* https://api.flutter.dev/
* https://stackoverflow.com/questions/tagged/flutter?sort=frequent
If you have found a performance problem, then fill out the template below.
Please read our guide to filing a bug first: https://flutter.dev/docs/resources/bug-reports
-->
## Details
<!--
1. Please tell us exactly how to reproduce the problem you are running into.
2. Please attach a small application (ideally just one main.dart file) that
reproduces the problem. You could use https://gist.github.com/ for this.
3. Switch flutter to master channel and run this app on a physical device
using profile mode with Skia tracing enabled, as follows:
flutter channel master
flutter run --profile --trace-skia
Then press P to enable the performance overlay.
The bleeding edge master channel is encouraged here because Flutter is
constantly fixing bugs and improving its performance. Your problem in an
older Flutter version may have already been solved in the master channel.
4. Record a video of the performance issue using another phone so we
can have an intuitive understanding of what happened. Dont use
"adb screenrecord", as that affects the performance of the profile run.
5. Open Observatory and save a timeline trace of the performance issue
so we know which functions might be causing it. See "How to Collect
and Read Timeline Traces" on this blog post:
https://medium.com/flutter/profiling-flutter-applications-using-the-timeline-a1a434964af3#a499
-->
<!--
Please tell us which target platform(s) the problem occurs (Android / iOS / Web / macOS / Linux / Windows)
Which target OS version, for Web, browser, is the test system running?
Does the problem occur on emulator/simulator as well as on physical devices?
-->
**Target Platform:**
**Target OS version/browser:**
**Devices:**
## Logs
<!--
Run `flutter analyze` and attach any output of that command below.
If there are any analysis errors, try resolving them before filing this issue.
-->
```
```
<!-- Finally, paste the output of running `flutter doctor -v` here, with your device plugged in. -->
```
```