Random Lag?

This is pretty weird. If you browse http://www.pgtour.net, sometimes, page with a lot of information (such as the forum with a lot of post) lag a lot and take long time to load.

Weird thing is that it doesn't affect everyone and those who it affects, it doesn't affect them all the time.

For me, when it does that, page like this:
http://www.pgtour.net/forums/viewtopic.php?t=3183&db=bw
can take around 5 seconds to load (all I get is the black background: http://imgsrv.pgtour.net:1338/temp/lag.jpg until it loads completely).

When it does it for me, it last few hours at least and if I ask to some other friends, it doesn't do it at all for some of them and for some other, it lags too.

We are with layeredtech.com (so dedicated) and on the planet network.

We use thttpd and traceroute to pgtour.net is fine.

Any idea what could cause this?

Thanks.

Edit: Oh and this only affect pages with a lot of stuff as I said, not small pages like:
http://www.pgtour.net/viewpage.php?db=bw&id=23
http://www.pgtour.net/replaybw.viewall.php?db=bw
http://www.pgtour.net/members.php?db=bw
Etc...

 

 

 

 

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