What is normal time range for request processing?
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Are we to assume you mean web GET requests? – Dave Swersky Mar 09 '09 at 22:15
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Yeah very subjective question - could be an hour for a batch system, could be a second for a busy web server. – Mar 09 '09 at 22:39
3 Answers
Anything between 50ms to 500ms would be good.
This of course is only the server side. Have a look at Yahoo's Best Practices for Speeding Up Your Web Site and Firebug YSlow on learning and measuring the response times on the client side as well.

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In my limited experience, the user will generally notice an interactive site as being slow if responses are routinely taking over one second. A few seconds or more can be maddening. By "interactive", I mean something where the user is going to be generating a lot of pages, like a forum.
Here's an interesting article / book snippet about response times: http://www.useit.com/papers/responsetime.html

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Anything slower than 8 seconds is generally considered too long. 1-2 seconds is average for most heavy websites.