Finally I upgraded my MacBook to 4GB RAM. I wanted that long before but I never did it. Actually I don’t know why. I guess there were some factors which hold me up. But now I got 2 2GB RAM bars for 53 Euros which isn’t really much and I decided to do it – well some OutOfMemory help me with the decision 
But now I’m just happy having 4GB in my MacBook and that thing is really fast again *yepee*
