I am always in high performance mode. the only thing i will do is change the brightness of the screen when i am indoors. I am completely stock with no mods or ruu. the phone does get hot when charging and streaming music but not to what i consider excessive. i will have to check the temp when i am outside for a while again. I usually overclock all my tech and if things get to hot things start to breakdown. my rez has been rock solid and I have never had a problem that would indicate my phone was overheating. If anybody has a phone that starts acting weird from heat or the battery drains to quickly I would return it. the only other thing I would recomend is do install carat. It is a battery app made by the tech college in southern california. That could help to indicate in something is constantly using your battery and therefore increasing the heat.