Hello to everyone. I've just bought my first mac, a MacBook Pro Retina 13'' i5 2,4ghz 16gb ram 256gb ssd. I am an advanced pc user-gamer and everything by the way... I wanted to go into the whole apple experience since I'm a long term iphone and ipad user and I was thinking about the "continuity" thing for this fall. I was impatient, and when it arrives... what a tremendous dissapointment... I wasn't looking for gaming on this laptop, but it lags on its own os' UI!! This is incredible!! If I resize the App Store manually clicking on the right down corner and moving the mouse, it's like a netbook running a full HD screen without graphic card drivers!! it's horrible. Just opening Pages and doing the same operation, it is not as bad but it looks like less than 12 fps! even the apple logo, when the macbook starts and moves upward so you can enter your password is laggy, no more than 7 fps or so. Not to mention when I installed Photoshop and was trying to zoom and move a 3mpx photo or resizing the program window... After realizing this, I went to my local store. I tried the 15'' with gt750, full spec. The lag still exists, it is not as bad but it is not enough at all either. I don't want to offend anyone but seriously, if this is normal, how could you buy this and not feel cheated? It's shameful. Right now I'm using a fx8320 16gb ddr3 hd5850 desktop with win 8.1 and it feels like 10 evolution years faster than the macbook I bought. I'm returning it, and I will wait until new GPUs or yosemite are released, to see if they can fix this... But right now, I feel, again, sadly very dissapointed. My main goals were engineering programs through bootcamp and light everyday use and photoshop under mac osx, sadly I'll have to pass at least for now.