This seems like it could lead to worsening packet delivery from networks causing other protocols to do badly, since so far tcp has needed, and ip networks have delivered, near zero packet loss.
I will be interested to see how HTTP/3 fares on Virgin in the UK. I believe the Superhub 3 and Superhub 4 have UDP offload issues, so it's all dealt with by the CPU, meaning throughput is severely limited compared to the linespeed.
Waiting for Superhub 5 to be officially rolled out before upgrading here!
CPU on client or server? Client is probably negligible overhead while server is something that needs to be dealt with on an ISP level. Linespeed and latency live in different orders of magnitude to client CPU processing / rendering.