Xcode findings

As I start experimenting with Xcode I realise that it is a tricky beast.

Xcode 10.2.1

I realised Xcode 10.2.1 used 100%+ CPU. I fixed that by reinstalling it completely.

Reainstalling Xcode I had managed to mess upp the simulators.
Error: Unable to boot device because it cannot be located on disk
Solution: Run in Terminal: xcrun simctl erase all

Xcode 7.3.1

Xcode 7.3.1 Fails to start on macOS 10.14.5.

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