XCode 12 builds very slow

Hello, we are experiencing an issue: with Xcode: 12.5.1 and react-native: 0.63.4, either with the Legacy Build or with the new Build System, doing and Archive to compile the build is very slow.

We have looked at various threads but have not found a solution that has worked for us.

Furthermore, we analyze the Report and we dont see an specific bootleneck, but to do an Archive in XCode takes now ~3 hours (before the changes ~30/45 min). Any suggestions on how I can speed up compile time? We are not succeeding.

Thank you very much and greetings. 

react-native info
info Fetching system and libraries information...
System:
    OS: macOS 11.4
    CPU: (8) x64 Intel(R) Core(TM) i5-1030NG7 CPU @ 1.10GHz
    Memory: 389.30 MB / 16.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 12.18.1 - /usr/local/bin/node
    Yarn: Not Found
    npm: 6.14.5 - /usr/local/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  Managers:
    CocoaPods: 1.10.1 - /Users/davidgarcia/.rvm/gems/ruby-2.7.0/bin/pod
  SDKs:
    iOS SDK:
      Platforms: iOS 14.5, DriverKit 20.4, macOS 11.3, tvOS 14.5, watchOS 7.4
    Android SDK: Not Found
  IDEs:
    Android Studio: 4.0 AI-193.6911.18.40.6514223
    Xcode: 12.5.1/12E507 - /Applications/Xcode_12.5.1.app/Contents/Developer/usr/bin/xcodebuild
  Languages:
    Java: 11.0.9 - /usr/local/opt/openjdk@11/bin/javac
    Python: 2.7.16 - /usr/bin/python
  npmPackages:
    @react-native-community/cli: Not Found
    react: 16.13.1 => 16.13.1
    react-native: 0.63.4 => 0.63.4
    react-native-macos: Not Found
  npmGlobalPackages:
    *react-native*: Not Found
XCode 12 builds very slow
 
 
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