Good morning everyone, I've been looking around the web quite a while for someone with a similar problem as I haven't found people with anything exactly like me I thought I'd ask the experts! Essentially I've been having lag issues on my MacBook Pro for a little while now. However unlike other posts I've found and read they occur when It's plugged into the power source. So, example, when I'm gaming and the Mac is plugged in, it will start to lag. However when I unplug it, it starts to run normally again. I usually let it run until it's almost out of battery and then I have to play the lag game again which is rather frustrating. Furthermore I've had some serious overheating issues with my Mac, according to SMCFanControl the fans are always running full capacity and temps usually range from 60-85 when either streaming or gaming. I'm not sure if this is relevant, but I've attached the specs too and some additional information (I'm not actually sure how to put it in as an image, sorry!) - MacBook Pro Early 2011, 15inch - Processor 2.2 GHz Intel Core i7 - Memory 16 GB 1333 MHz DDR3 - Graphics AMD Radeon HD 6750M 1024 MB - SSD 256GB (84GB Available) - System Version : Mac OS X 10.7.5 (11G63) Also, there are a couple of dents in my casing which may or may not be relevant. Thanks everyone! Alex.