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I'm running some latency measurements using Web Page Speed Test on a static javascript file. I compared hosting the file at four locations: Host Monster, Amazon S3, Amazon Cloudfront, and Heroku Static Sites.

The results I'm getting are around 240ms-390ms, the worst being Host Monster. The tests were run from the default Web Page Speed Test data center at Dulles, VA, USA. The S3 zone I used was "US standard".

My question is - isn't 240ms+ latency a bit too much for just serving a javascript file (33kb minified before gzip - Host Monster and Heroku have out-of-the-box gzip, it's a bit less seamless for Amazon Web Services do not so I didn't enable it for this test). What top latency should I expect when serving a static 30kb file from the US to the US?

How can we to the sub 100ms latency zone?


Here is a sample latency breakdown from Web Page Speed Test on Amazon CloudFront:

DNS Lookup: 49 ms
Initial Connection: 59 ms
Time to First Byte: 123 ms
Content Download: 28 ms
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I just re-found these posts about Stack Exchange's CDN - they're seeing sub-100ms from Amazon and other hosts. meta.stackexchange.com/questions/90073/… meta.stackexchange.com/questions/90921/… – ripper234 Oct 18 '11 at 14:57
up vote 1 down vote accepted

I think the issue was with me using the default setting on Web Page Speed Test. Try using FIOS under Connection Settings to get a more real measurement.

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i can clearly say that the website you are using is not accurate. use firefox install firebug and test the speed yourself. i live in Turkey and the file i am downloading from USA took total 173 ms. you can delete all history cached data for more accuracy. i used my own host for test. file downloaded first time.

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Thanks, see my answer. – ripper234 Oct 26 '11 at 6:56

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