Hi @vish, welcome to the forum
301 literally means that you were redirected, common reasons why are: lack of “www.” in front or “/” at the end … or w/e else was configured on the server you use. This can also be after a POST request or something like that.
This is usually easy to spot looking at the URLs (and methods) in the web UI.
I don’t know about the average as that depends on whether there is a difference between the response time for the 301 and the 200 - if there isn’t - there is no difference ;). But you are making one more request than needed if all it is happening is that you are being redirected from
www.example.com/ or something like that.
Hope this clears things up