This is co-released with the core framework release
stopOnFailconfiguration file element.
DisableAppDomainrun setting from VSTest was supported for execution but ignored for discovery. This has been fixed to be honored now for both, which should dramatically improve discovery performance for any .NET Framework project which has
denied. In simple testing with 10k tests on a machine with an AMD 5900X CPU and 64GB of RAM, this cut discovery time roughly in half, bringing it in line with the discovery time for .NET Core projects (which never support app domains). xunit/visualstudio.xunit#331