I'm sorry, you're right, I should have provided more information.
The server is a dedicated server at rackspace.
- Memory: 6 GB DDR RAM
- Hard Drive: 250GB SATA
- Hard Drive: 250GB SATA
- Whitebox Server: Dual Socket Dual Core AMD Opteron 2214HE
- Linux OS: Red Hat Enterprise Linux 5 - 64 bit
The web server software is Apache.
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By the way, when I disabled hooks (for myself only) it was still slow sometimes, even though the page generation time (provided by debug mode) was much less.