Hi folks, I was wondering if Mountain Lion may give a Performance boost to older Macbook Pros. I have noticed that the memory controller has changed big time in allocating memory to running programs. Before the upgrade to ML, iStat showed only minor "Page Ins" compared to now with about 2,3 million !! This is big time change! Please check yours in iStat, especially if you have 8Gigs of Ram and have monitored Page Ins with Lion before. I bet you will notice a change. I think ML has a better memory allocation. Also most of my 8Gigs of Ram is in use now. This was significant different in Lion! Please check yourself, I would be thrilled to hear your observation. Thanks folks!