USB is like a Swiss Army Knife for PC manufactures that allows them to use some dirt cheap electronics for some common tasks. While it does all sorts of functions OK, it really can't do anything great other than save the OEM mfg money. Try this on any system that has PS/2 ports. Attach a Kyb and mouse via PS/2 and do a cold boot and time the duration until you reach a desktop or logon. Repeat the test using both Kyb and mouse USB. Do all attachment while power is completely off. The results may surprise you as to how much difference it can make. Consider USB to be almost like the floppy controller of old - it doesn't totally monopolize the CPU but it sure wants to grab a (time) slice any chance it gets.
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