I have now tested the new Version 1.2.1.0009 with Sam and Max.
This first difference is a graphic Bug between the 1.2.1 and 1.2.1.009
These pictures have a yellow bug i think and are from 1.2.1:
With the new version the graphic looks fine:
The loading time with the new version was a little bit longer and the new version was not faster with Sam and Max.
With both Versions i see no menü with the verbs @ IJ4. After i push F5 and Resume the menu is the correctly there.
in the 0009 Version the intro Screen with the Lucas Arts Logo is missing @ S&M and IJ4. But thats no problem because its really slow.
Edit: IJ4 has also the yellow bug like S&M below. And after i tested also IJ4 i can say both versions has the same rate (felt)