Magento Shop Speed Up

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
We have a shop based on the community edition of Magento. The project is finished but we can't get it running as fast as we need it to be. We already tried doing some improvements but are stuck. The product pages seem to be loading ok but the category view pages load very slow (12-14 Seconds) for no reason whatsoever.

The job would be to get the store faster without switching to a different webhost by improving the scripts and the database.
The Shop can be viewed here:

It is running a MySQL Version of: 5.5.31
This is our webhosting:
Cache and compiling is activated and running and we installed the following cache extensions: Fooman Speedster & Zoom Full-Page Cache.
We already tried making a magento database repair.

More facts can be delivered if needed

Skills required:
Magento, MySQL
About the employer:
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