which reduces latency compared to that of TCP

On the surface, QUIC is very similar to TCP+TLS+HTTP/2 implemented on UDP. Because TCP is implemented in operating system kernels, and middlebox firmware, making significant changes to TCP is next to impossible. However, since QUIC is built on top of UDP, it suffers from no such limitations.





Key features of QUIC over existing TCP+TLS+HTTP2 include

Dramatically reduced connection establishment time

Improved congestion control

Multiplexing without head of line blocking

Connection migration

QUIC is a new transport