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1. CPU, memory and bus speeds will affect the overall speed of a computer. If one is significantly slower then it will slow down the others.

2. CPUs with multiple cores have more power to run multiple programs at the same time.

3. CPU cores have to communicate with each other through channels and this uses up some of the extra speed.

4. If the clock tells the CPU to execute instructions too quickly, the processing will not be completed before the next instruction is carried out. If the CPU cannot keep up with the pace of the clock, the data is corrupted.

5. Cache is a small amount of memory. It temporarily holds instructions and data that the CPU is likely to reuse.

6. The CPU control unit automatically checks cache for instructions before requesting data from RAM. Transfers to/from cache take less time than transfers to/from RAM.