The freebee code in this document just optimizes singe geometry sections in a single shape – ie: it “polylines” each geometry section in the shape. It doesn’t combine sections in any way.

If you used it on a group (probably with some code mods first to walk the group!), the group would have the same number of shapes, and the same number of geometry sections, but the total row count in the geometry sections can be drastically reduced.

Last caveat, it only works well for geometry that consists of straight line segments. This thing will seriously munge a shape with lots of curved segments–if those curves are actually noticeable.

One note: I think metafiles turn curves into straight-line segments. So imported graphics might have curves that are composed of lots of small line segments anyway. I’m not sure how well Visio imports curved line segments from other format in the first place.