Comment by Veserv

It is fairly straightforward to implement QUIC transport at ~100 Gb/s per core without encryption which is comparable or better than TCP. With encryption, every protocol will bottleneck on the encryption and only get a mere 40-50 Gb/s per core unless you have dedicated crypto offload hardware.

However, the highest performance public QUIC implementation benchmarks only get ~10 Gb/s per core. It is unclear to me if this is due to slow QUIC implementations or poor UDP stacks with inadequate buffering and processing.