Viewer 2 works PERFECT on Linux.
I have more than 40 fps, actually, most of the time. With FULL HD Res, maximum shaders, antialiasing 4X and anisotropic filtering, of course.
Decent video card + drivers OK + Viewer 2 +all of gstreamer/fluendo/ffmpeg/lame codecs + Linux = TOTAL SATISFACTION.
.... And no, It isn´t difficult. Just a little different.