For most database maintenance applications on my server, Fiddler
reports request
response times in the 15-150 ms range, typically - on the local
network.

Great response times! To be clear, I was referring to single _database_
requests, not total page requests.

A response to a login request may trigger something like 86
asynchronous requests

Are you sure those aren't just requests for other elements on the page
(js, css, img, etc).

They evidently use persistent sockets.

Why is that evident. I would think they wouldn't do that as a general
rule. The places I've seen the "big boys" using persistent connections
are finance.[google][yahoo].com (stock quotes) and facebook's chat
window. Their persistent connections also talk to highly customized
servers on the back end. They're dealing w/such huge volumes they don't
normally want to leave the socket open long.

-Walden



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