Does Microsoft's Service Pack 2 for XP slow down FireWire?

Apparently some people installing Service Pack 2 for Windows XP on their PCs are experience some slow down in connection speeds with their FireWire peripherals. It's not the end of the world since once you update to SP2 you can just go back an install the SP1 FireWire drivers, but it is a headache and we've been holding off on installing the update until we hear some more. Anyone experience oddities with SP2?