I'm not quite sure what's causing it, but since the update I've been getting some quite significant jitter / framerate drops every second or two. The screen just paused for a split second, then carries on. This happens both with and without icon grouping turned on. Maybe it's just a factor of the number of ships in the galaxy, but I've dropped right back to 1 1/2 hours into this game and I'm still seeing the same thing.
This windows 8 box doesn't seem to respond well to any of the recent performance updates, really.
EDIT: Also, it's now started crashing to desktop whenever I exit back to the main menu for some reason. Crash dump is attached. That might just be because I cleared out my auto-save folder and killed the 'LogicLog_' advanced logging files, but I can't see why.