I am among the (apparently) lucky few who have a maxed-out Retina iMac and have no major problems with performance, lag or overheating. That being said, there's never too much smoothness and I know some of you have had issues. I'm currently not at home and only on my MBA so I can't install the new update on my iMac, so out of curiosity and also to get the discussion going, I would like to ask you what your experience with 10.10.2 on your machine is. Are things smoother, more responsive, better optimized? Are there new driver versions for our cards?