Simulator on Xcode 10 became terribly slow

Question

Everything worked perfect on Xcode 9. But after updating to Xcode 10, Simulator started to get huge lags. Super simple animation is working on 2 fps and whole Mac OS is super sl

Answer 1

I had the exact same problem as described here after upgrading to XCode10. Every time I opened the simulator, no matter if it was a IphoneX or Iphone SE, my mac crawled to almost a stop and the simulator performed with a couple of FPS.

The following did not work:

• FramebufferRendererHint settings
• Reset simulators
• Reinstall xcode
• Created new users
• Delete Xcode 10 and install XCode9
• Delete CoreSimulator.framework and install new simulators

What finally worked:

• Revert CoreSimulator.framework and Xcode.app using Time Machine(my last backup was from september 2017, so now im running Xcode9.1, but at least its working again(!))

Not sure if its relevant, but im working on a old IMac mid 2011.