MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
That is in there for a reason and yes it will increase print time because it adds more outlines... just hidden inside. That adds weight which helps it spin... this is particularly valuable in the outer areas otherwise you would want to increase the infill (which would slow printing as well) but that would also add weight to the centre. Weight out wide is what you need and this was designed in to help with that.