file upload taking longer for user than me

I have a really odd problem and i'm runnin开发者_开发百科g out of ideas of what might be the cause.

I have a page on my site which allows users to upload photos to the website. I have a particular user who says its taking around 2 minutes to upload a photo. However, when he uploads the same photo onto flickr, it takes about 20 seconds. He has provided me with the photo, I have logged into his account and used the same web browser and found that it only takes around 20 seconds for myself to upload the same file!

He is running IE9, Windows 7 64bit, decent spec computer and he's not on the other side of the world. We are both roughly the same distance from the server.

Any ideas what might be the problem or other things I should check?

This can also be a product of routing. If his isp doesn't have a peering agreement with your website host, the traffic can take some bottlenecked route. You can have the user try a traceroute against your host, and see if anything weird pops up. ISPs control the outgoing route, so that's why the user can download from your site with proper speeds, while the other way can go slow.