[Mediawiki-l] slow MediaWiki

[Stip]

Hi,

our MediaWiki-Installation at http://www.wiki-aventurica.de/ has 
terrible response times, ~5-10 seconds for each page. The confusing 
thing is: Other projects on the same server (two forums) run fine. We've 
tried optimizing, using tips found on some MediaWiki-articles, but 
nothing worked.

Here are some stats the server admin gave me:

31.01.2011 - 02.03.2011
52812 visits
209821 pimps

traffic (february)
55.57GB
traffic (january)
51.23GB

http://www.wiki-aventurica.de/info_.php

Any advice on how to speed our wiki up would be greatly appreciated.

Greetings
Stip