iMac Internet Connection Problems

I bought an employee a 20" Intel iMac last month so he could work from home now and again, and he's been constantly moaning about the speed of the Internet. So, I went over thinking it would be a simple issue, yet after 5 hours of fiddling about, just could not find a reason for it. I got straight onto his wireless network on my Macbook, without configuring anything, and it automatically connected with no problems at all.

What happens is that ping times are excellent, and download speeds eventually become full speed, yet web pages load about 90%, then take about 3 seconds to load the final amount, even if it's just 1 image. I was thinking this may be a DNS issue, but the settings are exactly the same on my Macbook as the iMac, and there's absolutely no issue at all.

Whereas my Macbook will start a download from Apple.com at 250kb, on the iMac it starts at 5 and works its way up, to eventually reach 250kb. Yet on web pages, it seems to take the opposite direction and load fast, then load slow just before the page is complete - non dependent of browser. Furthermore, typically, on his PC, there are no issues either.

He's setup on Telewest/Blueyonder with a brand new 20" Intel iMac 2.16GHz. I was thinking it was a DNS issue, but couldn't work out why it didn't need them entering on the Macbook, and then that it was a wireless issue, but why it would eventually get to full speed.

Has anyone any experience with this and know how to solve it?

 

I can't actually remember if I tried that one, but he's on holiday now. I'll give him a prod in the new year. Thanks.