Asp.net request in queued

I have a problem that is a page load performance. I have analyzed the problem with failed request trace on IIS 7. The problem is ASP.NET Request Queue Limit and relevant IIS configurations. You can find an example trace log below.

CALL_ISAPI_EXTENSION Dll    Name="C:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll"     10:59:15.926 
AspNetStart             Data1="GET", Data2="/busqueda.html", Data3="q=ET475MU11"            10:59:15.926 
AspNetReqQueued                                                 10:59:15.926 
AspNetReqDequeued                                               10:59:42.707 
AspNetGetAppDomainEnter                                             10:59:42.707 
AspNetGetAppDomainLeave                                             10:59:42.707 
AspNetAppDomainEnter        Data1="/LM/W3SVC/10/ROOT-1-129434506817181196"                  10:59:42.707 

My application specifications are; .NET 4.0 Web form, Classic pipeline application. SQL Server (SQL 2008 R2). It’s working on Windows server 2008 and IIS 7.5. Web server is a virtual machine and it has 4 CPU and 10 GB memory.

I have searched this problem on the internet. But I am confused and really don’t understand thread using on IIS, queue limit and relevant configurations. I need you开发者_StackOverflow中文版r technical feedback if you have experience this problem and configurations. Thanks in advance