D. Spencer Hines wrote:

I've run tests on several machines and CCleaner's Registry Cleaner has
improved performance on nine of them -- as compared to exactly
identical machines without CCleaner.

Do you have test results you're willing to share? How did you measure
the improvement in performance? Did you control for the effect of
Ccleaner's primary function (clearing temp files)?

I have an open mind. But I would also like to see evidence.