Tutorial: how to minimize file in SolidWorks without having to convert
Answered with a tutorial: https://grabcad.com/tutorials/tutorial-how-to-minimize-file-in-solidworks-without-having-to-convert
hopefully can help you and others.
Amazing! This reduced my file size from 46MB to 3MB. The reason was the following: I imported a complex STEP file and used it to build my model. I did not use any references to it. Then I deleted the imported model, but apparently its data stayed in the file. Weird behavior.
I can guess the file size cut came from either the thumbnail you see in your OS browser, and the pre-renders Solidworks made to fasten up loading.
One time i saved a complex model after a PhotoView session (and using the solidworks viewing appearance "photoview"). It was huge :/
you definitely get used to and often find things like this .. :)