Comparing HTTP/3 vs. HTTP/2 Performance

Comparing HTTP/3 vs. HTTP/2 Performance

One of the main touted advantages of HTTP/3 is increased performance, specifically around fetching multiple objects simultaneously. With HTTP/2, any interruption (packet loss) in the TCP connection blocks all streams (Head of line blocking). Because HTTP/3 is UDP-based, if a packet gets dropped that only interrupts that one stream, not all of them.

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Wiki HTTP/3