After a few days of stupendous RAM usage, thousands of Console errors and a random shutdown, OS X is now completely unresponsive. However, after creating a new user account the other day, I've noticed it's running beautifully despite whats going on over at my main, now unusable, account. Yesterday, I had over 50 Safari Tabs, PS, Mail, Calendar, Spotify and even Garageband for good measure, all running on the new test account for hours - and I had almost 2GB of completely free memory left. I would've been down to double-digit MBs on the main account. The last time I used it, I was down to 8MB (Yes, 8) with 1 tab and iTunes. The console errors included Calendar/Contacts AOSKit errors, a few Kernel related ones and even quite a few related to the Twitter App(?). BTW, it's a 2012, 27" base model.