WebSockets is very faster than xhr. I think jQuery had better support
WebSockets in Core.

The following Samples of text mining are speed comparison, WS vs  XHR.
at my Office(same bloga.jp), the speed difference was following.

/* need Chrome4.0.249.0 +  or Safari nightly */

http://bloga.jp/ws/jq/wakachi/mecab/wakachi.html
case websocket (pipeline) 156 msec
case XML HTTP request (parallel Ajax) 4978 msec
# 31-fold

http://bloga.jp/ws/jq/wakachi/mecab/ruby.html
case websocket (pipeline) 339 msec
case XML HTTP request (parallel Ajax) 1506 msec
# 4-fold

(http://code.google.com/p/websocket-sample/)

eg.
W3C The Web Sockets API
http://dev.w3.org/html5/websockets/
IETF The Web Socket protocol
http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-44

My jQuery plugin for WS
http://plugins.jquery.com/project/ws
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