Hi Dan, the surfaces look pretty smooth there - are you running with the default display mesh density?

By default MoI makes pretty dense display meshes, it can help reduce memory consumption by quite a bit to turn those down and make a rougher display mesh. It can also help to avoid bogging down the display as well since there's less data being shoved over to the video card.

To turn down the density, go to Options > View > Meshing parameters, and set "Mesh angle" to 30 degrees and uncheck "Add detail to inflections".

Then shut down MoI and try loading your heavy torus file into a new instance, does that reduce your memory consumption?

- Michael