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 slow while animation on Simulator is working. Anybody know what happens and how to fix that? Any app or any standard iOS app is the same terrible slow.

Explanation — it is NOT about slow motion that I can switch with Command⌘ + T. I am talking about huge lags. When UIView is flying it appears in another position jerkily. Not smooth slow animation. 2 fps is not slow motion. It is the same fast motion but in 2 FPS!

Answer 1

download iOS11.4 simulator and try it. The downside is you cannot test iOS12. But at least you can work on Xcode 10 and get the App released. Note: don’t bother to get Xcode 9.4.1. Or other versions. It won’t fix the problem. The trick is after you run Xcode 10 the first time, it installed the new coresimulator framework to your root folder.

Answer 2

What worked for me was switching the values in Debug > Graphics Quality Override of the Simulator menu. Surprisingly, after setting to 'Low' from 'Device Default', lag was gone, and now any value works like a charm.