Scroll the site in the url posted. When scrolling down a very noticeable jank happens when the fixed element is fixed to the top and side of the chart. I've seen this a few times before but never this jarring. There are references to _VEC_memzero and NtGdiDdDDIDestroyAllocation in the jank part of the profile. Turning off HWA does not produce the same effect and is quite smooth on transition. HWA ON - http://people.mozilla.com/~bgirard/cleopatra/?report=67a32b552ca6987f0643b4b2f1335a4bfb9cde4a HWA OFF - http://people.mozilla.com/~bgirard/cleopatra/?report=2bc23278ef182ab76b1408aa72c5cfbc96ad54ec
Confirmed on Nightly/Windows 7. FWIW, this Issue is with Firefox 4, too.
Status: UNCONFIRMED → NEW
Component: Layout → Graphics
Ever confirmed: true
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