Bought a MBP recently and was wondering if someone could answer the following: I do some processor intensive work on my laptop and see that the CPU usage hovers at around 90% by user in Activity Monitor. I am running this straight for over 8-9 hours daily. Am I by any chance killing my laptop? Or is it designed to withstand this kind of usage? Obviously, the fans are on full power throughout and only the area under the screen gets super hot (rest of laptop remains cool).