Xcode Simulator animations extremely slow when played in editor
XCODE 9 BUG. This is officially confirmed to be an issue with Xcode 9.0 and its iOS 11 simulator — it affects any OpenGL-using application.
See: https://github.com/mapbox/mapbox-gl-native/issues/9959
Also: https://twitter.com/xenadu02/status/911463433521860609
:( Hope this helps.
Currently only iOS11 simulator is slow.
You can download additional iOS10 simulator which works perfectly.
Choose Xcode -> Product -> Destination -> Download simulators... Then select any iOS10 simulator from the list (e.g. 10.3.1).
After that you will choose iOS version for most devices:
In Simulator menu, go to Debug > Slow Animations , and uncheck this option or simply do:
⌘ + T
If you press command+T it triggers the 'Slow animations' feature. I didn't noticed this setting until now. Doh!