Is there a hot swappable parent proxy?

Question

proxy

Subject
Case: distribution of proxies to users, which are tied by a proxy provider to a single ip
. one address is given to the client, and on the server it is already redirected to the parent proxy.
Now done through 3proxy - each has its own running instance, and when changing, it's just overwriting the config. And everything picks up.
It would suit, if not for a very long connection to the proxy.
Creating a connection, waiting for the creation of a proxy tunnel - that's all for a very long time
. What proxy servers do you recommend? Or what to do with 3proxy so that it doesn't slow down?
I would be grateful if you poke your nose into the manual

Answer 1

https://3proxy.ru/highload.asp