I'm running OS X El Cap (latest PB), and it works pretty well, but it's also pretty slow. I'm trying to get myself a new rMBP, but it's gonna cost a load of money for the exact one I want (any donations fee free to PM me XD). I was thinking maybe I ought to go back to Mavericks, just until I can pull up the funds for the new machine. Would you recommend this? Bear in mind that this machine I have now is the 2012 nr MBP 2.9 GHz dual core and 8 GB of RAM, so I can get Mavericks back through internet recovery. However, because I have the latest iLife and iWork software, I'm worried that going back is likely to cause compatibility problems. Can anyone say if this is true?