lol, for real it won't be effective, i played after that with the same setup but it works perfectly.

Damn, I didn't manage to reproduce this today : I played and the game was smooth and perfect (with the same setup as when it lagged) ! But it happens at least two times the last times I played !
I play with a E2180 and a HD 3650 with 2 gb ram
Here the logs however and the save that started laggy :

Same for me,
Sometimes, I have huge drop of framerate that makes me reload the game. I don't think it cames from the system specs because I play on the same config as always.

Hi,
To add a sort of pointer (with a touch or the middle mouse button) to visually communicate with the other player, to show or explain things about the factory or to localize where to build things can be really usefull in multiplayer. It can also send a signal on the minimap to ping peers and ...