By default, ACK delay is 200ms on Windows which terribly slows down conversations between client and server (when deployed on different machines). To avoid any slow down, TCP_NODELAY should be enabled on clients' socket too. More details: http://developers.slashdot.org/comments.pl?sid=174457&threshold=1&commentsort=0&mode=thread&cid=14515105 bzr revid: jth@openerp.com-20110117205959-8kxaz0of8ta9dmfw