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copied!<p>Not fun.</p> <p>Many root causes share common symptoms which makes it difficult to diagnose without getting dirty with the application. :) Pardon if some of these steps were implied.</p> <p>Some next steps might be:</p> <ul> <li>Review the IIS logs of each site looking for things like: <ul> <li>HTTP response codes (5xx,4xx,3xx)</li> <li>Request response times </li> </ul></li> <li>Review Windows Event Logs <ul> <li>How often are application pools cycling?</li> <li>Application errors, etc. </li> </ul></li> <li>Verify processModel settings as suggested by @vinayc to make sure predecessor didn't get 'tricky'</li> <li>Install <a href="http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=24370" rel="nofollow">DebugDiag</a>, its a surprisingly good tool for some basic analysis of memory and crash related problems.<br> <ul> <li>This can also help you capture memory snaps to diagnose later. </li> <li>Tess Ferrandez <a href="http://blogs.msdn.com/b/tess/" rel="nofollow">blog</a> can help make heads/tails of memory snap analysis. </li> </ul></li> <li>Understand how many web applications are running in each AppPool. </li> <li>Investigate using a 'web garden' to possibly help minimize number of users impacted by 'slow down' </li> <li>Is a virus scanner enabled? Is it running? If so, verify exclusions.</li> <li>Are application teams available to help troubleshoot? Identify if they have any custom application instrumentation that might help diagnose problem.</li> </ul> <p>Is the behavior 'new'? Or has it always been there? If 'new', can you track down which deployment might have caused the new behavior?</p> <p>Could the the description given of the 'slow down' behavior be attributed to an apppool recycle and resulting jitting of the application again? ala - the first request syndrome.</p> <p>Reviewing the logs helps understand how the sites/applications are being used, which can be especially important if you don't own the codebase. <a href="http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=24659" rel="nofollow">Logparser</a> is an excellent tool for doing some IIS log analysis (as well as other formats).</p> <p>Good luck!</p> <p>Z</p>

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