IIS 7.5, .Net 4.6
IIS 7.5,.Net 4.6
From the browser network diagnostics tab I can see that the requests are stacking rather than executing concurrently. This can be seen with the static content requests (e.g., stylesheets, images, javascript) which are waiting for the dynamic request to complete before they complete. I also devised a test where a javascript timer is used to make requests for static content on a regular interval. (Let's call it "http-ping". If I have a long running main request, these http-ping requests back up. From the