Both curl and file_get_contents request interfaces in PHP are very slow, but accessing them directly in the browser is very fast. Does this explain the situation?

This is the interface:
http://api.k780.com:88/?app=w...

The problem now is that no matter how I use curl or file_get_contents() to request the interface, it is very slow. I also checked it myself and it said that it is enough to change the domain name to IP, but IP will sometimes be changed, and this website configuration I have a virtual domain name and cannot access it using IP

I would like to ask if there is any way to shorten the time?