Will app/game get faster after it is published?

I am wondering if the test build of my app on my phone will have the same speed as it will after it has been released to the app store. I am guessing that the debugging and checking for errors take some of the processing power and my game will speed up when actually released.

Is this true or is it flawed logic? And if the performance does get better how much will it influence things like my frame-rate?