https://dropbox.tech/frontend/investigating-the-impact-of-ht...
(Discussed at https://news.ycombinator.com/item?id=36027702.)
For the majority of our global users, HTTP3 reduced network latencies by 5-15ms (or 5%). While this is an improvement, these wins would appear negligible to the average user. At p90, however, HTTP3 demonstrated massive improvements, with a latency reduction of 48ms (or 13%)—and at p95, a reduction of 146ms (21%). This could be explained by the fact that HTTP3 is better at handling packet drops in parallel connections by eliminating head-of-line blocking; because packet drops are more likely to occur in networks with suboptimal connection quality, the benefits of HTTP3 are more visible at the higher percentiles.Of course it's true that QUIC is a complexity monster. OTOH HTTP/3 is actually quite simple when you have the QUIC layer implemented. A simple HTTP/3 server is no more than this:
https://github.com/aiortc/aioquic/blob/main/examples/http3_s...
People have definitely gotten more impatient over the years.