btw, HTTP/3 also uses UDP, but not many servers support it yet. not sure how good browser support is either. but it's awesome, like, so nostr uses http/1 or http/2 websockets, the equivalent with http/3/QUIC is "WebTransport" which is far better - not only is it over UDP, the sockets multiplex so where previously clients might open 5 separate websocket connections, each of them taking like 200ms of upgrade negotiation, with WebTransport it's one connection and i could be misremembering but the upgrade is not a round trip, you just fire off the open and then follow straight up with your requests and each goes on a separate part of the multiplexed connection.

probably is a couple years more before WebTransport and HTTP/3 are in common use but obviously this ISP will have to update their network security