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Chrome has enabled HTTP/3 by default since October 2020, resulting in improved performance including reduced Google search latency and fewer YouTube rebuffers. Recent updates in Chrome include the implementation of the HTTP/3 ORIGIN frame and Server's Preferred Address, which enhance connection coalescing and reduce round trip time (RTT) respectively. These features were introduced in M131, released to Stable on November 19. The ORIGIN frame helps pool domains onto a connection, while Server's Preferred Address allows migration to a more efficient server route, significantly lowering RTT.

Chromium Blog: Making Chrome QUICer