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Improve flutter build latency on iOS #9199

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Improve flutter build latency on iOS#9199
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P2Important issues not at the top of the work listc: performanceRelates to speed or footprint issues (see "perf:" labels)platform-iosiOS applications specificallyplatform-macBuilding on or for macOS specificallyt: xcode"xcodebuild" on iOS and general Xcode project managementteam-iosOwned by iOS platform teamtoolAffects the "flutter" command-line tool. See also t: labels.triaged-iosTriaged by iOS platform team
@xster

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@xster
xster
opened on Apr 4, 2017

flutter build ios takes 30+s on my monster mac pro. Would be nice to get it faster.

Some candidates:
100+ms to read the CFBundleIdentifier from the project
1000+ms to print the build settings to do some variable substitution. Maybe we can cache this.
400+ms to check cocoapods version. Maybe we can ask for forgiveness instead of permission
1900+ms to check cocoapods dependencies. Don't know if there's any caching we can use
22000+ms to run /usr/bin/env xcrun xcodebuild clean build -configuration Release ONLY_ACTIVE_ARCH=YES -workspace Runner.xcworkspace -scheme Runner BUILD_DIR=build/ios -sdk iphoneos -arch arm64. Do we really need to clean first?

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    P2Important issues not at the top of the work listc: performanceRelates to speed or footprint issues (see "perf:" labels)platform-iosiOS applications specificallyplatform-macBuilding on or for macOS specificallyt: xcode"xcodebuild" on iOS and general Xcode project managementteam-iosOwned by iOS platform teamtoolAffects the "flutter" command-line tool. See also t: labels.triaged-iosTriaged by iOS platform team

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