How does the number of cores affect cpu performance?

CPUs with multiple cores have more power to run multiple programs at the same time. CPU cores have to communicate with each other through channels and this uses up some of the extra speed. Therefore, if we increase the number of cores in a processor, there will be an increase in system performance.

Source: https://www.bbc.co.uk/bitesize/guides/zr8kt39/revision/5#:~:text=CPUs%20with%20multiple%20cores%20have,programs%20at%20the%20same%20time.&text=CPU%20cores%20have%20to%20communicate,an%20increase%20in%20system%20performance.

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