Michael,

when I have a curve and add a radius the first time the curve is fine.

the 2nd time I add a curve at another location along the curve (no matter how many) there are points added between all other bends so all the straights are suddenly split in half, adding points and thereby increasing file size.

attached a picture showing the situation.
- the polyline in the front has a radius
- the polyline in the background is a copy of the other and I rounded the corner on the left

=> suddenly 2 more points are added that I don't need. Why is that?