Why is the TTFB different on two domains related to the same site?

Question

Nginx

Actually, initially the site had a subdomain, registered a domain 3 days ago, connected it as a mirror in Nginx.
server_name csgofrags.ru cs.assorium.ru;
But the new domain is loaded from ttfb in 1 second, when the subdomain is loaded instantly. What could be the problem, where to dig?

Answer 1

I found the problem, all the time I thought it was related to the network, but still it was related to the application and not to the sites, but specifically to the sessions and OpenId.
I have not come across sites that fully support OpenId before, I always built authorization myself, without frameworks, but it didn’t work like that with Steam and the framework, when building a link for authorization, asked Steam for the necessary fields, every time.