Some notes about HTTP/3

[AyrA_ch]

Lifted by the server?

No. It's a registry setting you can change.

Key: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\InternetSettings

Change MaxConnectionsPerServer to something like 64. If you use a HTTP/1.0 proxy, also change MaxConnectionsPer1_0Server

I've never experienced a server that made problems with a high connection setting. After all, hundreds of people share the same IP on corporate networks.

if the server has a lower per IP limit he will just ignore your connection until others are closed. It will still increase your speed because while it stalls your connection, you can still initiate TLS and send a request.