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    <p><a href="http://www.websiteoptimization.com/speed/tweak/psychology-web-performance/" rel="nofollow noreferrer">Research has shown</a> that fast responses are a way to improve not only usability of a website. It's also a way to improve conversion rates or site usage in general.</p> <ul> <li>Tests at Amazon revealed that every 100 ms increase in load time of Amazon.com decreased sales by 1%</li> <li>Experiments at Microsoft on Live Search showed that when search results pages were slowed by 1 second: a) Queries per user declined by 1.0%, and b) Ad clicks per user declined by 1.5%</li> </ul> <p>People simply don't want to wait. Therefore, <a href="http://techblog.molindo.at/2009/11/efficiently-tracking-response-time-percentiles.html" rel="nofollow noreferrer">we track response time percentiles</a> for our sites. Additionally, nice visualization of this data helps with measuring performance optimization efforts and monitoring server health.</p> <p>Here is an example generated using Google Charts:</p> <p><img src="https://i.stack.imgur.com/SbLUa.png" alt="Percentiles left, response times encoded in colors"></p> <p>That looks bad! Response times of > 4000 ms certainly indicate performance problems that have a considerable impact on usability. At times the 800 ms percentile (which we consider a good indicator for our apps) was as low as 77%. We typically try to get the 800 ms percentile at 95%. So this looks like there's some serious work ahead ... but the image is nice, isn't it? ;)</p>
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    1. POHow can website hits statistics be helpful to improve usability?
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    1. COconversion rates, not conversation rates :)
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    2. CO@Rowlf low conversation rates are a problem that is admittedly out of scope here ;)
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