Update: Apple have released OS X 10.8.3 Mountain Lion and Retina MacBook Pro SMC Update! This should solve your problems. I am leaving the original text below but try this update first if you haven’t done it already.
So I have written about my issues with the Retina MacBook Pro before. Another issue I have experienced is that if you run the computer at full speed it will eventually throttle down leaving you with sub-par performance. If you are affected by this a SMC reset should help, Temporarily though as the problem seems to come back after a while.
If you still experience issues I recommend you to take your computer back to the store to get it checked out or call Apple. It should not behave this way, if someone is telling you otherwise they are wrong.
Anyway: This is how you reset the SMC on your Retina MacBook Pro if it begins to feel slow / sluggish.
- Shut down the computer.
- Plug in the MagSafe 2 power adapter to a power source, connecting it to the Mac if its not already connected.
- On the built-in keyboard, press the (left side) Shift-Control-Option (alt) keys and the power button at the same time.
- Release all the keys and the power button at the same time.
- Press the power button to turn on the computer.
Note: The light on the MagSafe 2 power adapter may blink, change color or temporarily turn off when you reset the SMC.
After doing this your computer should be back to normal. After a while the problem appears though and if that is the case for you call Apple or bring the computer in.