Just checked out Roll20 with the new update, and map rendering and token movement are very laggy. I don't have the issues with maps randomly discombobulating themselves, or blowing to pieces, but the lag is very noticeable (for instance, moving a token is not smooth - it hangs for about 0.5 seconds, then jumps to the mouse cursor, then hangs another half a second, etc).
OS: Windows 7 Enterprise, 32-bit
Browser: Firefox 13.0
Flash: 11.2.202 (not sure if that matters anymore, but there it is)
Also...has the select/move tool always shown the 4-way mouse cursor when it hovered over things? I seem to recall it used to just be the normal arrow.