Hi mdesign, the main way would be to not have a dense sub-d cage with a lot of little polygons in it.

But also there is a setting under Options > Import/Export > SubD import options > "Patch type = More patches, fewer control points". That will make for smaller patches around non-valence 4 points but also less control points.

If you have a lot of little polygons in your sub-d cage though that makes for a complex result, each control polygon becomes a NURBS surface fragment. To get a simpler result you need a coarser control cage not a heavy and very detailed one.

- Michael