For the Mega Drive/Genesis the framerate depends on the region, matching the local video standard. The European Mega Drive uses PAL with 50Hz.

As the biggest part (but not all) of the demoscene is based in Europe, most demos target PAL hardware. The same is true for our demo group. NTSC ports can be very difficult if not impossible as PAL often does have a slight advantage in CPU cycles per frame. This is also the case on the Mega Drive.

Porting the polygon renderer shouldn't be a problem as it renders in an off-screen CPU RAM buffer. In the worst case it would have to skip more frames, having a lower effective framerate.

A lot of the other effects have very critical timing though. I've been told that porting some of them to NTSC is just impossible.