I just purchased a late 2013 rMBP 15" 2.3/16/512 two weeks ago. This is my first Mac, ever. I have read about scrolling stutter/lag with previous generation rMBP's. That made me wonder and I noticed that when in Safari scrolling through Facebook and TheVerge, the two websites will stutter. It's worse when browsing TheVerge, of course. And sometimes I don't have the issue while scrolling through Facebook. Other websites, like iMore, scroll extremely smoothly. The stutter/lag isn't horrible, but it's still there and makes me wonder if it is normal? I've searched everywhere, especially with google. I wasn't able to find any information with the late 2013 rMBP's scrolling issues. Other than that little issue, the computer performs flawlessly. Should I be worried about this scrolling stutter?