I've tested VV on everything from fast P4s and dual-processor systems, to pretty dang slow P2s, and have found that the villagers (and cursor) do move more slowly on the slower computers. It isn't necessarily all about processor type and speed. There are a lot of factors that affect game performance. When you also take into consideration that the game will yield priority to other applications, you can definitely see jerkiness when a lot of stuff is going on in the system (e.g. Windows background tasks, other apps, etc.).