Thanks for the report. I can see a potential bug in the log there. Unfortunately it may be with a third party piece of software we use. I'll contact their support today and try to turn this around quickly.

In the mean-time - It looks like the root cause is that it thinks part of the game is running on your inbuilt Intel GPU, and not your more powerful Nvidia GPU. Try closely following this guide here: http://brightrockgames.userecho.com/topics/1096-missing-invisible-or-laggy-ui/

Yeah I suspect we'll get it down around that time. Apologies for the inconvienence and thanks for the report.

Reviewed the savegame and determined the root cause - The top left area of the map has been blocked off by replacement wall and is a good case study in causing worker tasks to perform a full exhaustive path search, consuming 300-400ms of time every so often. Spoke with Stefan and unfortunately there is no short-term fix for it. We'll need to look into threading out the entire native pathfinder on to another thread some time next year.

Going to close this ticket for now, given how old it is and how many patches have since been released.

Savegames from a modern version of the game should have this issue fixed now.