I found the version 2 slower than the version 1 (in Windows), I mean, the menus take a little more time to be highlited after I hover them with the mouse and also the 3d models inside the editor moves in jumps without smothing the movement as in the previous version, that is a little frustrating. The grouping feature is buggied because it makes groups of objects that I don't grouped before (this happens when I am copying and pasting groups). Finally the movement with the arrow keys is slower than in the version 1 hindering the work.