Run fewer virtual machines at once: If you are running multiple operating systems at once using Parallels Desktop, stop one or more of them to improve performance of the others.Note: Do not install more than one Windows antivirus program. To be protected, you have to sacrifice performance. Antivirus software may slow down your virtual machine: Windows may become slower after you install antivirus software.To optimize the performance of both Windows and Mac OS X, set the memory allocated to Windows to be somewhere within the recommended range, indicated by the graphic under the memory slider in the CPU & Memory configuration panel. If, on the other hand, too much memory is allocated to Mac OS X, then Mac OS X applications may run well but Windows programs might slow down. If too much memory is allocated to Windows, Mac OS X may slow down, which in turn can cause Windows programs to slow down because they're running on top of Mac OS X. Change how much memory is allocated to Windows: Parallels Desktop is set to allocate a certain amount of your Mac's available RAM memory to Windows and the rest to Mac OS X.
That way, you'll have a better idea of which applications cause performance to degrade the most. You can also use Activity Monitor (located in the Mac OS X Finder in Applications > Utilities) to see how much of your Mac's memory each application is using. Quit any applications that you aren't using. Quit applications and programs you aren't using: If you run a number of memory-consuming applications and programs simultaneously, Windows performance may become slow.If Windows performance seems slow, try the following:
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