See the HTML5 slideshow in the URL field. The first six slides transition smoothly, but the switch from slide six to seven (as linked) is incredibly janky. We should do some profiling and figure out what's up.
I jut tried profiling this. 75% of my profile is under nsTextFrame::PaintOneShadow; about 8% of that is DrawText and the rest is unsurprisingly about half in BoxBlurVertical and half in BoxBlurHorizontal. Another 13 is gradient painting for the page background. Everything else is basically just noise. Short of doing the blur on the GPU, not sure what we can do here.
Component: General → Graphics
QA Contact: general → thebes
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