After almost five years in development, the new HTTP/3 protocol is nearing its final form. Let’s take a close look at the performance improvements of HTTP/3, congestion control, head-of-line-blocking, and 0-RTT connection set-up. Welcome back to this series about the new HTTP/3 protocol. In part 1, we looked at why exactly we need HTTP/3 and the underlying QUIC protocol, and what their main new fe
![HTTP/3: Performance Improvements (Part 2) — Smashing Magazine](https://cdn-ak-scissors.b.st-hatena.com/image/square/558e5d4a596b28392e6df22bf6548acfe4673eef/height=288;version=1;width=512/https%3A%2F%2Farchive.smashing.media%2Fassets%2F344dbf88-fdf9-42bb-adb4-46f01eedd629%2F9d5e5ddd-7a90-48c6-84c5-dc5c335e2305%2Fcongestion-control.png)