Shared vs dedicated php library

[lacHstar2]

I have a server which consists of several \[code\]Zend Framework\[/code\] application.I want to know if it is a good idea to upload \[code\]Zend Library\[/code\] on the server and share it among all the applications instead of uploading it per application.Does it influence speed if for example multiple applications request a library simultaneously or not.What is its Pros and Cons?Thx in advance.