There are many factors why CPUs are slow / fast. However the main factor is the processors speed and RAM storage/speed capacity.

If the processor is fast then the CPU will be very fast and programs will have fast response time.

There are a lot of Processors available each with different speed thus choosing a fast one on our own is a little complicated.

However when benchmark/ tested results of CPU speed allows us to choose a Processor with a speed of our reqirement considering other factors such as cost.

GO HERE for bench marks.

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