Disable floppy drive seek
The floppy drive seek BIOS option sets whether your PC will attempt to detect the floppy (a:) drive during boot up. Whether it finds one or not, once Windows has loaded it becomes irrelevant, as control of hardware devices including drives are handed over from the BIOS to the operating system.
Disabling the 'floppy drive seek' option in the 'advanced BIOS features' section of the BIOS can save you a few seconds on boot up, and since the setting has no actual effect, disable it.
Set primary display adaptor
Most motherboards have a BIOS setting entitled 'primary graphics adaptor' or 'Init display first' which affects whether the system will attempt to initialize an AGP graphics card or a PCI graphics card first.
While it has no effect on any other facet of system performance, setting the correct value here (many boards default to 'PCI') may save you a few seconds of booting time. This option can be found in the 'advanced chipset features' or 'integrated peripherals' sections of the BIOS.
Enable quick POST/memory test
Many motherboards have a setting in the BIOS which can instruct the system to skip through certain portion of the POST (Power On Self Test), speeding up boot times considerably. A variety of settings performing this function can be found on various motherboards.
Some examples are: 'perform quick memory test,' 'quick boot,' 'quick power on self test,' etc. Enabling these options will cause your system to boot faster.
Be advised that you should disable this option when you have made modifications to your computer's hardware, especially the memory.