It seem locked to 60 FPS (Confirmed by Render Timing, Compositor Frame Rate: 60 hz). Any other player works perfectly (Virtual Desktop, MaxVR).
GeForce GTX 980 Ti - Intel Core i7-6700 CPU @3.40Ghz (8 CPU)
Render CPU time: 13.43 ms
I have trouble with the stereo in your image, does it look ok in all directions in Virtual Desktop for you?
Related question: Why do you need CUDA for the viewer ? What is wrong with normal methods of mapping on cube, sphere cylinder e.t.c. ... ?
wglSwapIntervalEXT(0); works only if the user have set in nVida control panel Vertical Sync "Off" or "Use 3D application setting". If the user set "On" he will get the 60 Hz refresh rate because the wglSwapIntervalEXT(0); command will be overwritten and ignored ... I believe this is the reason of the 60 Hz mysterious issue 😉 ...