I've got a little question.
Whent i try to test the existance of a window :
It's really quick when the window exists but it takes a lot of time when the window doesn't exist.
Is it normal ? Is there a way to change it ?
Yes. There is a ObjectTimeout setting which is by default 20 sec. So if the window does not exist it will give 20 secs for it to appear. If you don't want a timeout use direct time