HTML rendering in Thunderbird

I generally like Thunderbird, but I think their HTML rendering sucks on Ubuntu: it is way slower than on Windows, and I find myself waiting for pages to display, over and over again.  How come?  I thought it used the same rendering engine as Firefox, which is decent on Gutsy.

I hate HTML email as much as the other guy, but it really can’t be helped.

Let’s wait for 3.0 and see.