So after looking in several threads I assume that there is a problem with older hardware (specially the gpu) and Monterey / newer Xcode versions. I don't know which gpu you are using but older ones have problems with OpenCL (which looks like Xcode is using). If you have a discrete and internal gpu try the following: -Open the Simulator or launch it -Under File/GPU Selection choose "Prefer integrated GPU" (this will only use the internal gpu of your Mac.) -Close Simulator and Xcode and try it again with newer Simulators like 13.4 or above. (But be aware that the performance is lower than with the external gpu)

Hi, yes i've send the feedback via FB9983188. Hoping for a solution — Noem less than a minute ago

Sorry for my delayed answer. I've tried the terminal command, but with no success. Now, there is a new error message: "TimeoutError: Timed out waiting for connection to DTServiceHub after 15.0 seconds." The problem is, that i can't manage to send the zip. Here is my attached file (the summary text) from diagnostics: previews_diagnostics_summary.txt Thank you

Same issue for me. I am on Catalina. But after updating Xcode from 12.3 to 12.4 the performance lost is heavy and everything that worked good, now ist very very slow. I hope Apple is fixing this.