Problem:

On some single clients data flow is very slow. At other clients fast.

Solution:

Disable the option for automatic proxy search (Einstellungen automatisch erkennen).

Background information:

If searching is quick but loading of images slow then the problem is clearly on the side of the http-file system.

And because every load happens over an own connection the following has to be considered:

Detailed information on the PARTapplicationServer can be found under PARTapplicationServer einrichten.