I have set up a bridge according to instruction here :- http://wiki.squid-cache.org/Features/Tproxy4 with squid 3.1.19 and kernel 3.2.21. The configuration is working with other with most of the sites, except for yahoo mail. It's is extremely slow with yahoo mail, can hardly able to login and logout of yahoo mai. However the same computer when switch to nat REDIRECT using squid intercept, it is working OK, ie it is fast enough. Anyone observed the same issue ?