iMac retina for general user

[phpmaven]

I'm REALLY lost here. . . what kind of "lag" are you referring to???

GPUs do not cause system lag. If they run out of memory during something like gaming then, yes, it'll have to refresh and that can cause momentary freezes, but you won't see that on the desktop.

And I wouldn't worry about a little more temp on candy crush either. 103c CPU on die temps while playing Diablo 3 and WoW, however, no thank you.

https://forums.macrumors.com/threads/1815601/

I assume he's referring to the glitches going in and out of Mission control and going to Time Machine. Even with the full Monty system like I have, you still see jerkiness and lag going in and out of Mission control.