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BIOS stands for Basic Input/Output System, which is inbuilt in every PC during manufacturing and is loaded, run and executed when you press the power ON button of your PC. The BIOS is a sort of firmware interface for a computer. Different components, such as pen drives, graphics card, keyboard and mouse and disc drives attached to a computer, need to be initialized and identified to the computer. The BIOS does this in the form of a check-list ("turn USB ports on", done) and this procedure is known as POST (power-on self-test). The operating system itself is a program, which needs to be loaded and executed. This too is performed by the BIOS, which locates the OS program on the computer's hard disk and runs the program.
There are various reasons why you may need to know what the processing speed of your computer processor is. It may be that you need to verify whether your processor matches the operating requirements specified for a new software that you planning to get installed. It's also possible that you have bought a new assembled PC and you need to verify whether the vendor installed all the computer hardware components as you ordered. Whatever be the reason, before you can proceed, you need to know what are the specifications which determine the speed of the processor. Let me briefly explain how processor parameters decide computer speed.