Strange sim speed change on save/reopen

[finalight]

This issue reminds me of when I had similar slow downs. Fresh scene, newly created box - sims fast. Then I save it to the project folder and sim is incredibly slow. If I resave to the local workstation 'my documents/3dsmax/scenes' folder, it's super fast again. I save all sim scenes this way now. Still don't know why it's slow saved outside of 3dsmax install folder structure. Do note that I run multiple versions of fumefx - haven't determined if the latest version has this issue.

I think the issue for me started in 3.x.x. Have another post about it somewhere.