All programmed instructions have to go through the central processing unit (CPU). It handles all of the computations and can instruct other programmed instructions to go to other sub-systems like your memory, storage, video cards.
It’s speed is dictated by how fast it can perform these commands denotes in its clock cycles in this modern era of computing we call GHz or gigahertz or billions of cycles per second. That’s what the cpu does. It’s the brains of your computer.
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