In Fire We Trust

Usually i am quite content with wordpress and it’s behaviour, but not the last days. It just act’s slow and sluggish.
When you click on a page it waits for something like 15 secs and then opens in a blink of an eye. I just don’t know what to do it. And not to mention that parts of the content can’t be reached at all.

For example the pictures in the previous post. No chance to reach the real picture.

This behaviour is observed both on the front page, the archives, the categories and in the backend.

Now start giving some ideas what caused this. I moved to a new host, but this is irrelevant because all the other PHP scripts i tested awre working perfectly.

The system is as follows:
Apache 2.2
PHP 5.2.0
Mysql 5.0
WP 2.3.1
some plugins but nothing fancy

If you need more info just say.