IDE causes high cpu / fan usage

less than 24hrs later...

IDE has just been sitting there in the background for the last 3hrs (been running for about 12hrs..disregard the info in the status, that compile was done about 3hrs previous)..usage was 0% when i left it...then all of a sudden i notice fans spin up and never spin down...and its maxing out a core..

this is also a full desktop system..not a laptop...