How do I know if my CPU has decreased speed or what speed my cpu is running?

I recently noticed that when running PRO app my MBP seems pretty slow unusually. I have met this occasion before . I heard that when temperture is too high , the CPU will decrease its speed to protect itself.  How do I know if my CPU has decreased speed or what speed my cpu is running?
Thank you!
MBP 8,2  10.6.8

Enter in the search field of Google 'CPU speed monitors' and you should get some results.
Ciao.

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