Youtube works fine in Windows, but in Ubuntu GNOME 15.10 video is very not smooth. Framerate drops, the lag is very visible when things move on the screen.
- both Firefox and Chromium have this issue, although the latter is slightly better;
- Ubuntu GNOME 16.04 booted from a USB stick acted the same way;
- I have an AMD video card;
- I tried both the open and fglrx drivers;
- I have "Resticted extras" installed;
- Youtube itself says my browser supports everything;
- Vlc plays these vids very nice and smoothly.