Hi Mr. Yuri, can you send me an example file where you're getting slow performance with a simple extrusion? Either post it here or e-mail it to me at moi@moi3d.com if you wish to keep it private.

For that particular case there probably isn't too much you can do to speed it up since most of the work will be done with only one CPU core. MoI does use multiple CPU cores in specific situations like for processing objects on opening files, in the display engine, and when doing a mesh export. But it's a very difficult job to make use of multiple CPU cores because operations have to be split into smaller "work items" which can then be distributed among the different cores and there also has to be some coordination between the cores. So for many cases you should see just one CPU core being maxed out, not all of them.

I can give you better information though if I can test the .3dm file that is giving you problems over here.

- Michael