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Re:Nginx-1.14.0 stable version has been released by Twirrim on Wednesday April 25, 2018 @11:59AM (#16922811)
First you get a PUSH_PROMISE request that is a single frame. It's tiny.

That tells the client what the server wants to send.

The client can respond with a an RST_STREAM frame https://http2.github.io/http2-spec/#RST_STREAM Again, that's a single frame.

By design it's meant to be extremely small and quick even on high latency, and/or low bandwidth connections.

Re:Nginx-1.14.0 stable version has been released by thecompilr on Wednesday April 25, 2018 @12:22PM (#16923095)
You imply that there is a delay between the promise and the push, but it is not necessarily so. In fact the promise and the data may be sent in the same packet.