Because i allready have some Zend Applications, Zend Framework is already on my webspace and IMHO it's unneccesary to provide it also with every xenforo installation.
So to save some webspace, i've deleted all Zend directories from the xenforo library path and linked them to my "xenforo zend source directory"
ln -s ~/sources/XFZF ~/ragtek.org/www/xenforo/library/Zend
I'm also linking my Add-on directory because i have all my addons in a special directory
Saved my in sum ~70MB only because of these 2 links