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Paul Hinett
Asked: 2010-03-20 11:17:58 +0800 CST

HTTP downloads slow - FTP of same file very fast - Windows 2003

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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.

Paul

ftp windows-server-2003 iis

3 Answers

  1. Found out the reason for the slow downloads in case others have the same problem.

    I was running a tool called IISTracer on my server, apparently there is a known issue which reduces file download speeds to around 80kbps.

    As soon as i disabled this my download speeds shot up to 330kbps!

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  2. While FTP is and should be faster, not that much.

    Have you tried any packet sniffer , port scanning / tests?

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  3. Quite possible that your isp is throttling http traffic, or your http trafic is taking a different route to other traffic. If you going through a transparent layer 7 http proxy/cache it may be overloaded.

    Try using some online tools to see if your being proxied.

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