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Enable Video BIOS Shadowing
Shadowing is the process of copying slower ROM code into underlying RAM memory to improve performance of the ROM routines. Aside from the system BIOS, the most commonly-shadowed ROM is the BIOS ROM on the video card. The routines on the video card are executed often for some types of operations, so enabling the video ROM shadowing feature will result in a small performance improvement.
You may experience lockups or other problems when enabling this option. In my experience it will work on most systems, but it will cause problems on some. Disable it if this happens, although this may be a sign of a broader problem with the motherboard or video card, which you can troubleshoot here and here, respectively.