First of all, thanks a lot to Ironrind, who have given me some advices to improve the running performance from Game Maker Games (like disabling the "synchronizing to avoid tearing", and setting the priority to high or highest). So, I uploaded a new demo exe, which you simply can put and also replace in the same current folder from the downloaded DEMO, and run.
http://www.bcsilva.com/download/bs2demo2009_EXE.zip
I hope resolving this lag with this.