@RyChannel I got an update from one of our SEs who knows Windows well
"He was on the right track with ConfigurationMode option per Microsoft's documentation: https://learn.microsoft.com/en-us/powershell/dsc/managing-nodes/metaconfig?view=dsc-1.1
The slowness is normal unfortunately, I'm curious if their org has PowerShell Transcription enabled via Group Policy or something."