Xcode is running really slow

Question

I've recently tried to use Xcode 8 to make iOS apps and to test things in Swift however it is impossible to work on as doing a simple 'print("Hello World")' takes easily over a minute to process to print it to the console, I tried doing regular development as well by creating UI buttons etc. but when I try to compile it, it is too slow to work and that is with simple things. My computer is the Mid 2012 Macbook Pro Non-retina with 4GB of RAM, not a quick computer but I can program in Python without these problems. If anyone knows some solutions please tell me! Thanks.

Answer 1

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."

Answer 2

Same issue for me. I had execute these instructions two times before the app would launch without hanging for a minute.

1. Unpair your phone from xcode
2. Launch xcode with your phone not plugged in
3. Plug your phone in
4. In xcode, under devices, unpair your phone
5. Stop xcode
6. Run the following commands

• rm -rf ~/Library/Developer/Xcode/iOS\ DeviceSupport
• rm -rf ~/Library/Developer/Xcode/iOS\ Device\ Logs
• rm -rf ~/Library/Developer/Xcode/DerivedData

7. Start xcode
8. Plug phone in