Requesting chrome for a long time

While testing my web app in Chrome, I noticed that a single request takes too long to load (sometimes 20 seconds).

According to heroku magazine

at=info method=GET path="/1/message_feeds?competition_id=xxx" host=xxx.xxxxxxx.com request_id=0e521307-ea37-41c8-9aaa-cebec40fe106 fwd="80.216.26.9" dyno=web.3 connect=0ms service=184ms status=200 bytes=11738

      

        
        
        
      

    

Indicates that the request is being serviced by the server for 184ms;

I also checked the request time from the chrome dev tool, it shows the total request time is less than 1 second.

Note: Loading the same request in less than 1 second in Safari and Firefox

Why did it take so long to load in Chrome?