The "sluggish" BIOS will do absolutely nothing to hinder your performance in windows games and applications. I would NOT recommend flashing the video card's BIOS in an attempt to get rid of this unless you read up somewhere that doing this is guaranteed to work.
This is actually a useful setting. If you have problems with IRQ assignments, you can set this to "disabled" to let your BIOS manage the IRQ assignments for hardware devices.
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