My Windows virtual machine (VM) is running in Coherence view mode on Retina display (or external display). Retina view mode is set to Scaled. When I move the application window on the screen I see visual artifacts which feels like low Windows performance.
Running Windows VM on Retina in Scaled view mode requires an excessive amount of video memory.
- Exit Coherence.
- Suspend the virtual machine.
- Quit Parallels Desktop.
Open Terminal.app and execute (copy-paste the entire command):
defaults write "com.parallels.Parallels Desktop" "Application preferences.CoherenceOsScaling" 1
- Start Parallels Desktop, resume the VM and enter Coherence.