Pause Windows when possible is a feature designed to automatically pause a Windows virtual machine to save your Mac resources and battery. Pausing Windows virtual machine releases CPU resources which are currently used by Windows. Then released resources can be used again by the Mac, its applications or by other virtual machines on the computer.
Starting with Parallels Desktop 16 you may configure a custom period when this option will be enabled for your virtual machine.
If you select this option, the virtual machine will be automatically paused if:
The virtual machine is running, but its window is not active for more than selected time period
- There are no applications running in Windows (no icons of Windows applications are present in the Dock)
To manage this feature, navigate to the virtual machine's configuration:
Go to Options tab > Startup and Shutdown > check the Pause Windows after... option > and select prefer time period
In Parallels Desktop 15 and below
Go to Options tab > Startup and Shutdown > check the Pause Windows when possible
The virtual machine will be automatically paused when virtual machine is running, but its window is not active for more than 30 seconds only.