Much better graphics handling on my modest i3 linux box  :-)

moving large stl's is far more fliud and responsive :-)

I have a 37MB stl of Degas 'Little dancer' that was a real PITA to position in earlier versions , so slow it was difficult to get it in just the right position. Now the movement is fast and fluid.

Adding supports now is much faster too.

I still have a problem with one of my larger stls , a coil bobbin ; the old version could only handle 6 before freezing . 1.9.1  was able to handle 10 and was still just about useable (seems to be a memory is handling issue as there is plenty of available RAM )