It's a common misconception that Nagle's causes the delay problem. The problem is tcp delayed acks. Nagle's can improve network efficiency (and latency as a re

It's a common misconception that Nagle's causes the delay problem. The problem is tcp delayed acks. Nagle's can improve network efficiency (and latency as a result) on slow links. On fast links it shouldn't have much impact at all. The rest of what you said doesn't make much sense to me. Searching for \n\n is a property of HTTP, it's nothing to do with TCP. TCP is meant as a generic connection oriented protocol that uses packet switching, and it's largely optimized for that. The main benefit of QUIC it seems is that it hides itself in UDP so middleboxes don't tamper with it. It isn't really a fault of TCP itself that middleboxes mess it up so much.