I just did a test to move a small part up a few inches using sketch/enter in translate dragging from a selected point on a line. On V26 it took 1:04 minutes. On V29 3:04 minutes. It takes most of the time just to get the selector points to show up after shift>clicking on the line. It takes about 10 seconds for any rightclick > OK.
Here you can see the initial full screen shot, this is a wall unit that is 2d, about 300" x 300". No Z depth. The other images show the beginning and ending position of the small section I am needing to replace.
This is a 2meg bobcad file that is about 300"X x 300"Y area.