Seems pretty stable on the iMac with the specs i gave before. I did what I (a newbie) would consider a fairly complex (study see attached). A flow with a high number of spherical solids to a twist to a boolean. When I tried to boolean all at once the it failed to produce the desired result however when I boolean in small bites the the end was successful. The old shortcuts and the scripts I tried work. script for quit Alt+Q or Cmd+Q works well and it holds my changes except for the full screen for which I just click the green button. Will keep testing on other machines.