Majorly weird cookie problem

No, I haven't got the munchies or anything.... this is just bloody weird.

For about 2 weeks now, I've been having trouble with this site when accessing from work. Takes an age, sometimes 1 minute+ to change pages. At first I thought it was down to the site, but when I got home, responses were fine. Then I thought it was the internet pipe at work. Currently 6mbps, soon to be 50mbps (it does have to be used between 3500 people potentially!).

So, I tried my testbed machine. Worked a treat. So, using CCleaner (nice tip that Jake, BTW), cleared my cookies out. Started running like a badger with it's arse on fire. Yet 10 minutes later, slowing down again. Cleared cookies again, like a rocket.

What I don't get is, why only the one machine? While I clear my cookies out on a regular basis at home, it's not several times a day, which is what I'm having to do at work. And it's only this site. Every other site I frequent has absolutely no problem. Baffling.

I have no problem clearing my cookies several times a day, but I'm intrigued to see if anyone can shed a little light on it.

I hereby award you a "Bastage".