Sorry, I guess your computers must be so fast that they do the entire frame within 1 ms then. I had a little check of delta time > 0 (in case it would wrap around), but now changed it to >= 0.
It should now be a little over 60 fps. If I try to get it exactly at 60 fps, it will stutter on systems where OpenGL does wait for the retrace.
New build ID is: 2498995