Severe performance problems with Xcode 15

Sharing some findings.

We just got done migrating to Xcode 15.1

  • With Intel Gen 2 and x86_64 simulator - All of our Unit and Snapshot tests are passing. :white_check_mark:
  • With M1 Medium and x86_64 simulator using Rosetta2 - Our Snapshot tests pass, but our Unit tests seem to be randomly failing due to tests not asserting within the mentioned timeouts. :x:
  • With M1 Medium and arm64 simulator - All of our Unit and Snapshot tests are passing. :white_check_mark:

Looks like running the tests on x86_64 simulator using Rosetta2 seems to be slower in general.

Anybody else notice similar?