Plasma arc's look faceted when cut, not sure why?

[marbles]

Unless you have some mechanical issues with your machine then I would say that this letter was drawn as a polyline.

Thanks for thoughts. I suppose what i should do is run a file which is exported as dxf 12 to confirm or eliminate that. On that letter 'a' it appears to do some of the curves fine but is cutting corner on some of the tighter radius. This could be a mechanical issue, as the x axis is extended quite some way and something is causing a harmonic micro wobble, for want of a better description. I'd certainly be interested to hear back about my Mach3 settings as they might be an issue.