Page loads in random spurts?

[andars]

I have an odd problem. Pages that use php seem to load in a random spurt fashion. What I mean by "spurt fashion" is it will take 2-3 seconds before it loads the first php script, such as the index of a phpbb forum. Afterwards, every page on the forum loads instantly. Static pages, such as html pages, always load instantly. ISPCP always seems to load instantly as well despite it using php scripts. I don't think it's an issue with my computer or connection setup as I have not had this problem before. It's difficult to explain, so I linked the example sites.


Some examples of what I'm talking about are:

http://www.game-sales.info/forums
http://www.burntferret.com/forums
http://www.ravenholt.info/test.php

My computer specs are:

1.5 mbps upload
A64 3700+
1 GB DDR433 RAM
2x74GB 10k RPM (WD Raptors) in Raid0 using mdadm