LDAP access et modification problem

Hi,

I have two problems with the LDAP capabilities of Jahia.

The first one is that Jahia gather all the information from the LDAP 
server for each visited page. As if the cache weren't used. By the way, 
these LDAP requests are very slow if we compare them to another LDAP 
client for which it works fine. What can we do ?

The second point is that when we make a modification to LDAP users or 
group, this modification isn't seen by Jahia. This is strange regarding 
the first problem. And flushing the LDAP caches isn't sufficient : after 
the flush of all caches, it works fine. The question is, how does the 
LDAP cache work and is it possible to make the cache expire sometime ? 
So that the guy who modify the LDAP doesn't need to refer to the Jahia 
administrator.

Regards,

Cédric