Kamrul Hassan has written quite a good deal on how to optimize ans increase the performance of your WordPress powered blog, in his article he says the most common reasons why WordPress sometimes seems sluggish are:

* MySQL server or connection issues.
* PHP Memory Limit.
* Apache log rotator problem (for Apache server).
* Broken/Degraded PHP code in template/theme files.
* Excessive plugin uses/ use of plugin(s) with broken codes.
* Some particular third party widgets/ JavaScript codes.
* WordPress Dashboard’s display of RSS feeds.
* Pingback attempts when posting.

An excerpt:

PHP Memory Limit
The heartbeat of WP is PHP, so obviously when something goes wrong with that you will have issues. By default PHP is a beast with all kinds of nasty modules it thinks it needs to load. So the more it’s loading, the more memory you need. Why not control what to load? Disable as many extensions you are not using to save memory. There is a very useful guide on PHP configuration optimization.

Solution: Optimize your PHP configuration, avoid loading unused modules.

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