Which library is easily less than 10k? Chromium QUIC is 250k+ according to ChatGPT

Mine. I implemented it myself.

Not fully standards compliant since I skipped some irrelevant details like bidirectional streams when I can just make a pair of unidirectional streams, but handles all of the core connection setup and transport logic. It is not actually that complicated. And just to get ahead of it, performance is perfectly comparable.