My project is very basic one. Simply it shows hello world label to the user. When i run my simulator for the first time it is taking around 5-6 minutes to run and finally it was ended up with an error message as "Failed to initiate service connection to simulator request timed out". When i run again by pressing run button in Xcode9 there is no issue. I want to know what is the reason behind it and also i observed that my mac is getting slow while running my simulator, why?.
There is no issue when i run on any physical device.
Had a similar problem. For me the reason was there was an instance of the non-beta simulator running in the background. Make sure to quit all Xcode related applications and restart.