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c: performanceRelates to speed or footprint issues (see "perf:" labels)Relates to speed or footprint issues (see "perf:" labels)c: regressionIt was better in the past than it is nowIt was better in the past than it is nowe: web_skwasmSkwasm rendering backend for webSkwasm rendering backend for webfound in release: 3.31Found to occur in 3.31Found to occur in 3.31has reproducible stepsThe issue has been confirmed reproducible and is ready to work onThe issue has been confirmed reproducible and is ready to work onplatform-webWeb applications specificallyWeb applications specificallyr: fixedIssue is closed as already fixed in a newer versionIssue is closed as already fixed in a newer versionteam-webOwned by Web platform teamOwned by Web platform team
Description
Steps to reproduce
- Check out Flutter to commit
34ea67bdbf2233a6cd15a617f7d95466991f6137 - Compile the Wonderous web app in release mode with WASM enabled:
flutter build web --release --csp --source-maps --target lib/main.dart --wasm --pwa-strategy=none - Run the app with dhttpd
- Observe low FPS in web app
- Downgrade Flutter to commit just before:
f2e0a2afb35cefe48600c81f39e163db00cff89f - Clean
- Compile web app in release mode with WASM enabled
- Run the app with dhttpd
- Wonderous App is smooth again
Expected results
- Flutter WASM web app runs smoothly with no performance degredation
Actual results
- Flutter WASM web app runs with much lower FPS than before
Code sample
This can be demonstrated running the Wonderous web app: https://github.com/gskinnerTeam/flutter-wonderous-app
Screenshots or Video
No response
Logs
Logs
[Paste your logs here]Flutter Doctor output
Doctor output
[!] Flutter (Channel [user-branch], 3.31.0-1.0.pre.373, on macOS 15.4 24E248 darwin-arm64, locale en-US) [475ms]
! Flutter version 3.31.0-1.0.pre.373 on channel [user-branch] at /Users/brian/lab/flutter
Currently on an unknown channel. Run `flutter channel` to switch to an official channel.
If that doesn't fix the issue, reinstall Flutter by following instructions at https://flutter.dev/setup.
! Upstream repository unknown source is not a standard remote.
Set environment variable "FLUTTER_GIT_URL" to unknown source to dismiss this error.
• Framework revision 34ea67bdbf (8 days ago), 2025-04-02 14:27:09 -0700
• Engine revision 34ea67bdbf
• Dart version 3.8.0 (build 3.8.0-257.0.dev)
• DevTools version 2.45.0-dev.0
• If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.
[✓] Android toolchain - develop for Android devices (Android SDK version 36.0.0) [1,335ms]
• Android SDK at /Users/brian/Library/Android/sdk
• Platform android-36, build-tools 36.0.0
• ANDROID_HOME = /Users/brian/Library/Android/sdk
• Java binary at: /usr/bin/java
This JDK was found in the system PATH.
To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
• Java version OpenJDK Runtime Environment Homebrew (build 17.0.14+0)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 16.3) [881ms]
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 16E140
• CocoaPods version 1.16.2
[✓] Chrome - develop for the web [94ms]
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[!] Android Studio (not installed) [94ms]
• Android Studio not found; download from https://developer.android.com/studio/index.html
(or visit https://flutter.dev/to/macos-android-setup for detailed instructions).
[✓] IntelliJ IDEA Ultimate Edition (version 2024.3.5) [94ms]
• IntelliJ at /Applications/IntelliJ IDEA.app
• Flutter plugin version 83.0.4
• Dart plugin version 243.26053.17
[✓] VS Code (version 1.98.2) [9ms]
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.106.0
[✓] Connected device (3 available) [5.9s]
• Briphone (wireless) (mobile) • 00008120-000A20980233401E • ios • iOS 18.3.2 22D82
• macOS (desktop) • macos • darwin-arm64 • macOS 15.4 24E248 darwin-arm64
• Chrome (web) • chrome • web-javascript • Google Chrome 135.0.7049.84
! Error: Browsing on the local area network for Brian’s iPad. Ensure the device is unlocked and attached with a cable or associated with the same local area network as this Mac.
The device must be opted into Developer Mode to connect wirelessly. (code -27)
[✓] Network resources [246ms]
• All expected network resources are available.
! Doctor found issues in 2 categories.
ditman
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Labels
c: performanceRelates to speed or footprint issues (see "perf:" labels)Relates to speed or footprint issues (see "perf:" labels)c: regressionIt was better in the past than it is nowIt was better in the past than it is nowe: web_skwasmSkwasm rendering backend for webSkwasm rendering backend for webfound in release: 3.31Found to occur in 3.31Found to occur in 3.31has reproducible stepsThe issue has been confirmed reproducible and is ready to work onThe issue has been confirmed reproducible and is ready to work onplatform-webWeb applications specificallyWeb applications specificallyr: fixedIssue is closed as already fixed in a newer versionIssue is closed as already fixed in a newer versionteam-webOwned by Web platform teamOwned by Web platform team