Optimization Settings

Using the Optimization Settings , you can optimize your virtual machine performance.

Using Adaptive Hypervisor

Select the Enable Adaptive Hypervisor option to automatically allocate the host computer CPU resources between the virtual machine and Mac OS X applications depending on what application you are working with at the moment. If your virtual machine window is in focus, the priority of this virtual machine processes will be set higher than the priority of the Mac's processes and as a result more CPU resources will be allocated to the virtual machine, if you switch to the primary OS window - the priority of its working applications will be set higher and the CPU resources will be relocated to Mac OS X.

Compressing the Disk Automatically

If you use an expanding virtual hard disk in your virtual machine, its image file size on the physical hard disk increases as you add new data to the virtual hard disk. When you delete some data from this virtual hard disk, free unused space appears on the disk but the amount of space your virtual machine occupies on the hard disk of your Mac does not reduce. To regularly free the unused space back to Mac, use the Enable AutoCompress option. The virtual hard disk in an expanding format will be reviewed twice a day and, if the unused space occupies more than 50 percent of the hard disk image size, it will be compressed and the hard disk image file size will be decreased. As a result, there will be more free space on your Mac's hard disk.

Note: The AutoCompress option is available for Windows virtual machines only. Compressing can be performed for virtual machines without snapshots and with the Undo disks option disabled.

On the Hard Disk pane , you can compress the disk manually whenever you want.

Tuning Windows for Speed

You can make your Windows virtual machine work even faster by selecting Tune Windows for speed . This option disables some of the additional Windows features that tend to slow down the performance of Windows.

Optimizing Performance

To make your Windows virtual machine boot faster, select the Tune Windows for speed option. Some additional Windows features causing system overload will be disabled.

Note: This option is available for Windows XP and later Windows virtual machines.

The Optimize performance for option defines the priority of distributing the main physical computer memory resources:

• Click the Optimize performance for field and select Virtual machine to allocate more physical computer memory resources to the virtual machine and its applications. Selecting this option may significantly increase the virtual machine performance; however, it may slow down the productivity of your Mac OS X applications.
• Click the Optimize performance for field and select Mac OS X applications to allocate more memory resources to the physical computer and its applications. In this case, the memory resources usage will be optimized to provide better performance of your Mac OS X applications.

Optimizing Power Consumption

This option allows you to control the virtual machine power consumption when Parallels Desktop is installed on a Mac laptop computer that is running on batteries (for example, MacBook Pro):

• If you select Longer battery life in the Power consumption field, the virtual machine power consumption will be automatically reduced to provide a longer life for your Mac laptop battery.
• If you select Better performance , the virtual machine and its applications will operate at the maximum possible speed. However, enabling this option may significantly reduce your Mac laptop battery life.

If you select the Enable battery in virtual machine option, the battery status will be displayed in your virtual machine each time your Mac laptop computer runs on batteries. This option is available only on laptop Macs.

If you want to prevent Virtual Machine Configuration from further unauthorized changes, click the Lock icon at the bottom of the window. The next time someone wants to change the settings on any pane of Virtual Machine Configuration, an administrator's password will be required.