Sorry to be a bit on the slow side of response. I do not know if you are familiar with Exceed 3D plugin for Exceed? Sorry, I do not know the difference between accelerated indirect rendering and direct rendering, but I have some previous experience with former version of Exceed and what I am seeing now is not what I expect (from performance first and foremost). My beef is with OpenGL not getting properly through, but I assumed that the indication "direct rendering: no" is related to it, apparently not.
Now, I do not quite understand the difference. I can quite well tunnel the OpenGL through ssh with ssh -X from one linux to another and the performance is quite fine and you are right I get the direct rendering: no when I ask the glxinfo, however glxgears or an openGL application run just fine and the FPS from glxgears is about tenfold to that of windows. When starting such an application I do not get the message about missing NV-GLX extension as with Exceed3D from windows - that message might or might not be related to the performance problem I am having.
That would be the glxinfo locally: