Running DP2 (Don't call it a beta) on my retina Macbook Pro. 16GB of memory and I am sitting here looking at my iStats menu and memory usage almost completely filled. The computer lags. Webpages take a long time to load. Computer already crashed (restarted) once -- something that never, ever happens. Not seeing this on my 27" iMac, but then again, I have 32GB of memory on that. Just hope the next DP or Beta fixes the huge memory problem.