CPU speed is the frequency at which processors work. A 1Ghz processor can process 1 billion cycles per second, and this thing is known as clock speed. Greater the clock speed, faster is the device with respect to the processor. Any queries, please feel free to ask.
CPU acts like the brain of your smartphone . All the activities and processes which are done by your smartphone is done by CPU (expect graphical ones which is done by GPU) So limiting your CPU to 70% means that your phone will run on 70% of strength to conserve battery. If helped please give a like and mark it as an answer.
