Scheduling Windows Maintenance
From time to time, Windows needs to do various maintenance tasks like installing updates, cleaning and defragmenting the disk(s), etc. When Windows is doing these tasks, performance may slow down.
To avoid low performance when you're busy with important tasks, schedule Windows to run maintenance when you're away or at any time you like:
Do one of the following:
Click the Parallels Desktop icon in the menu bar and choose Configure.
Click Actions in the Parallels Desktop menu bar at the top of the screen and choose Configure.
Click Options and select Maintenance.
Select Start Maintenance and choose the day and time from the corresponding menus.
Once ready, Windows will do maintenance at the specified time.