Why?Because I just finished the SFML1.6 parallel calculating and sumohow the control-window-hang bug was fixed magically. I still don't know why but this is a definitely step towards a demo version.
So stay updated and have a nice day!
Oh, I forgot: the SFML2.x version uses C++11 Threads for synchronizing. I will slowly decrease the use of SFML to get a complete independent program :)