title: Azure AppService multiple instances no parallel handling
body: <p>I wanted to benchmark cloud services so I wanted to run this <a href="http://www.php-benchmark-script.com/" rel="nofollow">php benchmark</a> on azure App service. When i have 1 core 1 instance app service plan, the incoming requests are handled one by one (no parallel handling). When I switch to 2 core plan, the requests are handled parallel to each other. BUT when I use 1 core plan and 2 instances, it doesn't handle the requests in parallel. So what do instances exactly do, when the app runs only on one?</p>