I am having trouble with a sheet metal part file. It is slow to open or save and slow to change configurations.

In windows explorer I can see that the file is approx. 1.4GB! This is many times larger than any other SolidWorks file I have, even complex assemblies.

Any thoughts on how this may have happened? I would attach the file for someone to take a look at, but it is too large! This is really slowing me down.

I am using SolidWorks Premium 2013 SP3.0.