dfellis
commented
11 years ago ridiculous performance gains when you don't need to do a TCP handshake or account for the HTTP header overhead on each request and response.
The TCP handshake is amortized on the initial connection between the client and server and is only paid on the first message between the two, making it effectively "free" for any long-running processes. And of course the HTTP header overhead is entirely gone.
Here you are basically arguing for TCP but you say "ridiculous performance gains when you don't need to do a TCP handshake" (emphasis mine). There is a TCP handshake because it is TCP.