An internet browser that is used to run an application is said to be a thin client. But even thin clients can consume substantial amounts of CPU time on the computer that they are running on. This is particularly the case with complex web pages that utilize many recently introduced features to liven up a web page. Rendering a page after hitting a SUBMIT button may take several seconds even though the server may have responded to the request in less than one second. Testing tools such as WinRunner are able to be used to drive a Thin Client, so that response time can be measured from a users perspective, rather than from a protocol level.
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