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Definition of what puts pressure on IIS

I have a dedicated server that runs both IIS 7.5 and SQL Server 2010. The CPU load is often around 100%. The SQL server does not take up too much, but the w3wp process takes up a significant amount of CPU (often 70 +%).

I would like to know what causes this pressure: * Too many requests for static files (CDN can be added) * Too many requests for ajax (I still think about comets / web sockets) * Separate asp.net pages consuming too much computing power (should be easily optimized)

Where would you start looking for where to start optimizing?

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The immediate solution was to reduce the frequency of this call (from every 10 to every 30 seconds). The next step is to further optimize the server-side call, since I have other ajax calls with the same frequency (every 10 seconds), which almost never appeared in the list of active requests, since they were so fast.

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