rMBP 15" OS X 10.8.2 Fresh SSD erase and install OS X + update Installed: BTT and Flash Safari extensions: adblock Safari stutters (like a .5 second freeze) every 5 seconds when doing scrolling, typing, general browsing. The cursor doesn't stutter, neither does sound or streaming video (flash, html5, fullscreen or not). It doesn't always happen. But when it starts, the only fix is to quit Safari relaunch Safari. Any ideas...? Searching brings up stuff about flash video from years ago and I'm not having that problem. The one or two threads that are about general browsing stuttering have no answers.