Significant lagging with Sony HMZ-T2

[Sven]

Yes, it is the exact same script as before. In fact, the whole hardware setup is the same - we only exchanged the quadro card with the radeon (and the most recent drivers for it) and the nvis with the sony.
I checked the framerate, it is always at 59-60 Hz, both with my script and the simple script you suggested. The image is never stuttering, it simply lags behind. I guess I'll try a better card then.