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SwiftPM very slow fetching remote dependencies for first time #183659
Description
Add a firebase plugin like firebase_analytics to a vanilla Flutter project and time how long it takes to download the dependencies from a clean environment.
flutter create my_app && cd my_appflutter config --enable-swift-package-managerflutter pub add firebase_analyticsrm -rf $HOME/Library/Caches/org.swift.swiftpmrm -rf $HOME/Library/org.swift.swiftpmrm -rf $HOME/Library/Developer/Xcode/DerivedDatacd iostime xcodebuild -resolvePackageDependencies
The "real" time outputted is usually around 4 minutes
4 minutes to download 1 plugin and it's dependencies is pretty bad
I don't think it's related to my internet connection because I'm getting 120 Mbps down.
Activity
vashworth commentedon Mar 13, 2026
This is a common SwiftPM problem:
https://forums.swift.org/t/why-is-fetching-dependencies-with-swiftpm-so-slow/67191/23
https://ahmdyasser.medium.com/why-fetching-packages-using-swift-package-manger-takes-too-much-time-138982a0fba5
swiftlang/swift-package-manager#6062
vashworth commentedon Mar 13, 2026
When I run
du -sh *in the Derived Data directory created for the app, the size of the packages downloaded is 1.3GWarn about slow SwiftPM downloads and centralize SwiftPM cache (#183747)
Warn about slow SwiftPM downloads and centralize SwiftPM cache (flutt…
Warn about slow SwiftPM downloads and centralize SwiftPM cache (flutt…
vashworth commentedon Aug 25, 2026
We've done what we can: #183747
Closing.
github-actions commentedon Sep 8, 2026
This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of
flutter doctor -vand a minimal reproduction of the issue.