https://i.imgur.com/ilClL0u.png
I have two domain names registered with 2 different registrars, both pointing to the same website. Making a first request (when loading one and the same webpage) via one of the domains is twice longer than via the other (see screenshot for details). There is a single SSL certificate at use listing both domains (issued by AWS). One of the domains is an IDN containing non-latin characters, if that matters.
One of them is a 3-rd level domain [xxx.yyy.tf] pointed to the website via CNAME and the other one is a 2-nd level domain [zzz.top] pointed to the website via ALIAS.
Why is there such difference in performance and what can be done to make things better? What do I investigate/test next?
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