User`s guide

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Tips and Troubleshooting
• Antivirus software may slow down your virtual machine: Windows may become slower
after you install antivirus software. To be protected, you have to sacrifice performance.
Note: Do not install more than one Windows antivirus program.
• 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.
• Run Windows locally: If you start Windows stored on an external storage device connected to
your Mac (for example, an external USB disk drive), its performance will be lower than if it were
stored on your Mac.
• Tune Windows for speed: To speed up Windows, select Tune Windows for speed in the
Optimization pane (p. 106).
• Disable log messages: If you select Use detailed log messages in the Advanced pane of
Parallels Desktop Preferences, Parallels Desktop will start creating a more detailed log file. It can
be helpful for the Parallels support team, but uses more hard disk space and may slightly lower
the system performance.