https://forums.autodesk.com/t5/3ds-max-forum/max-2016-groups-cause-viewport-slowdown/m-p/5608469#M88738 <P>It's probably the scene explorer. Already in Max 2015 SP3 they introduced a severe bug that was affecting scene performance in a negative way. I reported it TWICE but (as usually) it probably did not get through.&nbsp;</P><P>&nbsp;</P><P>In 2016, i get quite bad playback performance in scenes that rely on groups heavily, but everything is on par with 2015 as soon as i close scene explorer.&nbsp;</P><P>&nbsp;</P><P>Ever since new Scene Explorer was introduced, it's been just problems on top of problems for me, so i fell back to using good old outliner script.&nbsp;</P><P>&nbsp;</P> Sun, 26 Apr 2015 10:43:14 GMT Anonymous 2015-04-26T10:43:14Z