I have a 27 imac i7 3.4 with 2 tb and 256 ssd. When i play starcraft 2 and i minimize it or have it in the back ground. The computer lags to type and everything I don't believe this is suppose to be happening. This is very annoying and on my 2009 iMac I didn't have this issue at all what could be the problem. BEcause this is def. something that should be happening at all.