The graphics performance issue is shared, at least so far, by all virtualization apps. The problem is caused by the virtualized operating system not having direct access to the Mac's underlying graphics system. To get around this issue, virtualization apps, including Parallels, create a virtualized graphics system that Windows and other virtualized OSes can make use of. The virtualized graphics system translates the graphics calls into calls to Apple's core graphics services. This extra software layer adds a hefty penalty in graphics performance, especially when compared to native performance.

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