This save puts you in the keep at Pantbronze - a town where it takes several seconds to move a single step (on my computer). Playing like that is not enjoyable in any way at all, IMHO. Having 1,967 human citizens, the town is not particularly large, and nothing else seems out of the ordinary about it. There are, however, dozens of cats prowling the streets (217 in total).

If anyone has the patience to go up there, this save also provides an example of the bug where it's impossible to reach the top level of wall towers by normal movement (i.e. via their interior spiral ramp).

This save uses a world generated by 0.40.10 and was last updated by 0.40.12, but the heavy lag remains when the save is loaded by 0.40.13.