There's http1's head of line blocking.. and tcp's head of line blocking. http2 fixed the former.. the latter applies to any tcp connection--including http 1.x,

There's http1's head of line blocking.. and tcp's head of line blocking. http2 fixed the former.. the latter applies to any tcp connection--including http 1.x, http2, etc (anything that uses tcp). In other words.. he's saying, because HTTP 2 is multiplexed, tcp's head of line blocking becomes a larger problem. Which is true.