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End users might not notice speed improvements, but they do respond to them, according to the data.

SPDY vs comet may be noticable if you're doing a real time game or something. But SPDY vs websocket should be the same.

I'm just saying, it's not "wow you can now do X you couldn't before". It's "Oh they made X a bit faster"

SPDY also speeds up ordinary page loading.