Is there another way you can use hardware when not all of it is being used, so it can free of some when you need it more?

Pathfinding is not actually as performance expensive as one would think. The individual pathfinding requests each turn can be (and are) nicely computed in parallel by the engine, so on machines with decent hardware concurrency they finish surprisingly fast. The render submission process and rendering itself are a much more perfomance-constraining factor.

Indeed, and unfortunately you cannot pre-calculate all possible paths. That could be possibly an acceleration factor. 

Okey, well, well.... seems I can not do that, my windowmanager (marco) thinks it is command to him..... I deleted the sections in xml-file, put them in again, and then removed actor attribut. It all simply changes nothing.  It is there but unselectable in Atlas and not there in the game.

Lilly poppy, I’m not too skilled at the map editor, but I do have a handful of trigger scripts that I can post that might help you out.