title: Too much memory usage of IIS application pool
body: <p>My Windows Server is running an web application on IIS 7.5.</p>
  
  <p>I'm wondering why IIS application pools use a lot of memory.
  <br><br></p>
  
  <p>Please refer to the screenshop I captured from the servere.</p>
  
  <p><img src="https://i.stack.imgur.com/2NhS1.png" alt="enter image description here"></p>
  
  <p><br>
  In the application pool named TEST 2.0 (.NET Framework Version 2.0), there is only one small web service. However, it takes about 3GB for Virtual Bytes.</p>
  
  <p>Also, in the application pool named TEST 4.0 (.NET Framework Version 4.0), there is only one web service doing nothing. However, it allocates about 9GB for Virtual Bytes.
  <br></p>
  
  <p>Do you know why IIS 7.5 occupies huge memory? What's the problem?</p>
  
  <p>Do you have any intuitive ideas about it?</p>
  
  <p><br>
  To give you more ideas, here is my system environment:</p>
  
  <ul>
  <li>OS: Windows Server 2008 R2 Standard SP1</li>
  <li>HW: Intel(R) Xeon(R) CPU X5670 @ 2.93GHz 2.93GHz / 8.0GB RAM</li>
  </ul>
  
  <p><br></p>
  
  <hr>