I have the same problem! The minimize/maximize animation is slow, choppy, and overall inconsistent. I have a fast computer with plenty of RAM (8 GB) and I still experience problems with it. It annoyed me so much that I just turned it off. I still show minimized windows on my Dock, but I use the following setting, which does not use the animation effect:
- On my dock: Taskbar options --> Show windows as their snapshots when minimized
Also, I turned off Windows' own Taskbar animations (and I hide the Windows Taskbar)
These settings seem to work better for me and minimized windows immediately appear on my Dock, with no lag or choppy effects.