dss, you are getting confused with the difference between speed and CPU utilization (or usage).
This is a simplistic analogy but: Imagine an 8 passenger mini-van. How fast it goes is "speed". How many passengers it carries while going that speed is "utilization". If all it has is a driver, its utilization is 12%. If you have 6 passengers - 7 people total, it is more heavily loaded and its utilization is 87% of capacity.
Back to CPU's: most applications do not stress the CPU that much. Your CPU normally spends a lot of time waiting for input from you.