homestream | simple Roku channel for streaming stuff

I am new to asp.net Core and so far I like it . I have a very simple action that just returns a string "Hello World" . My problem is that I think that http request are locking which is really slowing things down essentially just like this ASP.NET application to serve multiple requests from a single process . I am doing load testing my first request is 967 milliseconds however my 100th request takes 10927 milliseconds or 10 seconds which is incredibly long to return a simple string . This is being done in release mode .