I am trying to understand how to remove a bottleneck in our asp.net application Version of .net is 4.7.2.

Here is an async request from our service with approx 300kb of content:

Google chrome timeline

I have the same time from both ashx handler or MVC controller. I tried to enable compression but the download time is proportional to the content size. In debug mode locally in IIS express, the download content is done immediately. It seems that there is an open buffer that limits the data output. Is there a workaround to send data immediately without this download delay?

For production server, we are using Cloud Services in Azure.