I created a small video showing the latest MUI 4.0 running on a Amiga 1200 equipped with an 030/50 Mhz, 96MB RAM, Indivision AGA MKII. The feeling of the speed of it is really good, compared with the latest MUI 3.9R3. The installation procedure is the same with the older versions and it is really stable.
The speed of the video is in realtime with no fast forward, to see exactly how much time it needs to load and the refresh speed of the windows.
The music is from Tom Woxom - Kickstart album found at
http://is.gd/t22b5nMusic licence CC - Attribution-Noncommercial-NoDerivatives 2.0 France License.
You can find the video at
http://youtu.be/G70bbmr2Hfk