Some sub-systems may have better performance by setting jumpers , or flipping switches, on the video card. Consult your manual. Many cards come with 'flash' video BIOS which can be undated with software available free at the manufacturer's Web site. Do not expect a speed improvement from this. It is well known that a flickering monitor causes discomfort and eye strain.
Imperceptible flicker causes similar problems.
Network Server' is better than 'Desktop Computer' Optimize the File System. You can increase performance by changing the computer's 'Role' from 'Desktop Computer' to 'Network Server'. Your operation as a stand-alone PC is not affected. The improvement should be moderate - depending on your usage. In the Desktop Role your system is judged to be primarily a 'network client'.