Since its update to iOS 18.0, I have not been able to use the Simulator in Xcode at all. It is stuck loading for a very long time, and then it crashes. I managed to get it to start once, but it used up all of my system's memory immediately. I have not had any problems with the Simulator before the iOS 18.0 update. Additionally, after the Simulator crashing, the StoryBoard usually stops working as well, until I restart Xcode.
(I use an M1 MacBook Air with 8GB of RAM)