I am having some issues with download speeds on my site via http, i am averaging around 70kbps downloading a file that is around 70mb.
But if i connect to my server via FTP and download the same file on the same computer / connection i am averaging about 300+kbps.
I know my server has alot of connections at any one time, probably around 400 connections.
My server has a 1gbps connection to the internet so there is plenty of bandwidth available, as proven with the FTP.
I have no throttling of any kind enabled in IIS.
If interested there is a test file here you can download to check the speed: http://filesd.house-mixes.com/test.zip
I am based in the UK and the server is in Washington, USA if that makes any difference.