The NOR type needs to be ultrafast because it is directly connected to the centralprocessingunit of a computer and stores its basic input-output system (the operating system used by the microchip that lies beneath user-interface operating systems, such as Windows).
Those included stored memory (the ability to hold both a stored program and data), conditional control transfer, which allowed the computer to stop and be resumed, and the centralprocessingunit, which allowed all computer functions to be coordinated through one source.