It largely depends on what you have plugged in to your mobo.
You can disable various controllers to marginally improve POST times, if you are not using them of course.
For example, if you are only using the P67 SATA ports then you can disable the marvel controller.
Other than that
not using the onboard firewire/serial connectors - disable them
Not using a NIC, disable it
Ensure your Primary display type i set to PCI-e
etc.
There are probably a few more things, but it will make little to no difference!