Twitter engineer Dustin Diaz says NewTwitter has some major slowness due to jQuery
This is not the first time people have problem caused by switching to newest version of jQuery. Dustin Diaz, engineer at Twitter tweeted, "Turns out #NewTwitter has some major slowness due to upgrading from jQuery 1.4.2 to 1.4.4 - We will be downgrading." Dustin Diaz's further comments might prove useful...