My youtube videos began to lag like it's 15 fps after some time. Futhermore, then movies on hd.kinopoisk begam to lag too. It looks like that: for some time it's ok, then the "15 fps time" begins, I pause the video, go out of the fullscreen, unpause, go fullscreen back, and it's again ok for some time, but then all situation repeats again and again. There's no such problem in Chrome. Does somebody have the same problem? What can I do?