Yes, it's the same problem. I posted a comment there.

On 5/2/08, John Vivirito <gnomefreak@gmail.com> wrote:
Im leaning towards https://bugzilla.mozilla.org/show_bug.cgi?id=413280
more so can you please test the testcase they have see if you see same
issue? than if you do ill mark bug for upstream bug.


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Slow performance with Gmail
https://bugs.launchpad.net/bugs/217580
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Murilo Saraiva de Queiroz, MSc.
Senior Software Engineer  
http://www.vettalabs.com