Hi Lewis, that's something I definitely want to work on adding in. I've meant several times to start to work on a progress bar for large file loading but got side tracked every time so far...

Opening large STEP and IGES files is something you can do in MoI but things are not particularly optimized for that specifically as of yet.

The main focus for MoI right now is more about drawing simple things quickly and easily, so things like drawing tools have usually taken precedence for working on. But I do expect to work more on the large file handling aspect as well.

- Michael