close stack

[hershrev]

Hello,
I have a stack with a few cards on one of the cards I have about 70-80 
fields. It takes to close the stack with a script in a button on the 
layout
on mouseUp
	close this stack
end mouseUp
about 2 or 3 seconds , I'm wondering why?
If I close the stack via the close window button (the red button on the 
mac os x) or with a script in the message box it doesn't take any time 
at all.
thanks for your input , hershrev