Which menus are these?
We have been unable to reproduce any menus in Office animating as windows.
I'm sorry to have misled you, Neil. Office2010 technically doesn't have 'menus'. I should have said 'dialogs' - FileOpen, FileClose, FileSaveAs, OpenRecentFile; they all behave as windows (I assume they should) & use the Open & Close animations. I use a 1600x900 display with right-side Taskbar and have those dialogs set as large as I can. The Open & Close animations are choppy enough on my rig, particularly with large windows, to be a distraction so I've abandoned using them. The Minimize & Restore animations, on the other hand, are smooth and I still use them. The difference in quality between Open/Close animations & Minimize/Restore animations is significant on my rig for some reason. It's Intel graphics, of course.
I've seen an issue with WindowFX's own UI, BTW - the window opens with a lot of white blocks which fill in one at a time over a period of half a second or so - which I thought at first was due to the WFX animation, but it happens with the Windows default animation, too.