2nokkiaa: Don't use '-vo sdl' option, it is slow. Also '-ao gst' is not needed as it is already used by default. The only option you may want to use in some cases is '-vo x11' when playing video with non-optimal resolution (it will disable scaling, but will work faster). By the way, if you find youtube video clips that have playback problems (even after adding '-vo x11'), please report links to them here.