It's not a bug per se or suggestion...  Party movement is slow and jerky. 

It's been happening for the last few hundred turns, currently turn 830 or so.  Single player game not MP (so it's not net vagaries).  Party numbers 11: Sov, 4 progeny, 2 champions, 2 ebonwolves, and 2 npcs.  Removing the Sov and having him move on his own improves movement to normal.  The party without the Sov still moves slow and jerky but not quite as bad as with the Sov.  Adding the Sov back in with the others gives the slow jerky movement again.

This seems exacerbated when in a crowded environment (in the save there's an unexplored enemy city to the 'west').

So it seems to be due to the party size/composition and objects nearby.

My computer is only a year old and still fairly decent, so I think the game needs to better handle this as it's so jerky/slow it affects gameplay and the fun factor.

Saved Game

dxdiag 32 bit

dxdiag 64 bit

I've also noticed mobs near my seem to be suffering from it too -- very slow to move multiple tiles in their turn, and sometimes teleporting so there's sync issues.