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System BIOS Shadow
When enabled, this parameter turns on BIOS ROM shadowing for the block of memory that contains your system BIOS. This is normally F0000 to FFFFF (64K). See here for a full description of what ROM shadowing does; in short, it speeds up your system by copying the contents of your system BIOS code from the slow ROM in which it resides into faster RAM.
This setting normally defaults to "Enabled". Since the system BIOS code is used so extensively, shadowing it can cause a great deal of system performance improvement.