New Resizable Font?

When using UI such as displays, the refresh rate is often critical for the user experience

Yes - however the drawing should work fine on anything with an internal buffer, and if I'm honest the displays with external buffers have always been too slow, so I doubt this will change matters :)

Overfill could really be improved with a bit more work (supporting irregular polygon fills, and converting wide polylines into polygons). I guess there probably needs to be some benchmarking done.

What about: you keep g.setFontVector(s) and calculate the scaling factor to have a backward like compatibility as this could help not to mess up with the formatting of existing projects.

Yes, absolutely - that'd be the plan. It's just if you were expecting some text to be a certain width