Xcode 9 Simulator is extremely slow

Hi,


I've just installed the new Xcode 9 and I'm developing some simple apps just to learn the new features. But when I try to run the simulator or even use playground its extremely slow. It takes about 30 minutes for the simulator to run in the first place which causes a timeout error in Xcode, then it takes about 5 minutes for the app to start after the initial start. In playground I never get the results on the right and I have the status showing "Loading Simulator" forever.


Is there a setting or something I can change or something I can do to fix this? Also, just for information, I've also just update to High Sierra.


Thank you in advance,


Robert