Xcode is running really slow
When you build a project for the first time do it normally (it will take a while like you described)
After the first build Go to Product -> Scheme -> Edit Scheme. Select Build in left side column and uncheck Find implicit dependencies.
This appears to be a well known problem: https://forums.developer.apple.com/thread/62737
"If there's not enough context to decide, the compiler has to go with the conservative choice and record it as cascading."
Same issue for me. I had execute these instructions two times before the app would launch without hanging for a minute.
- Unpair your phone from xcode
- Launch xcode with your phone not plugged in
- Plug your phone in
- In xcode, under devices, unpair your phone
- Stop xcode
- Run the following commands
rm -rf ~/Library/Developer/Xcode/iOS\ DeviceSupportrm -rf ~/Library/Developer/Xcode/iOS\ Device\ Logsrm -rf ~/Library/Developer/Xcode/DerivedData
- Start xcode
- Plug phone in