We spend about 5% drawing the new balls and 14% in js. The rest of the time seems to be mostly in layout.

Here's the profile: http://people.mozilla.com/~bgirard/cleopatra/?report=9320596b4ce154109b715d7ae46505d0ecc87c40

CC'ing romaxa since he reported this bug before. We couldn't reproduce it because it was masked earlier by an overprinting problem.

Some of these signature are certainly caused by using making the pool thread safe: 1.7% pthread_getspecific Other that are likely hurt by this but I'm not sure: RgnRect::operator new RgnRect::operator delete RgnRectMemoryAllocator *

Another problem is that we're doing a sync transaction instead of hitting async transaction. This should only happen if we have canvas or image layers in the page.

Swift and indiscriminate back-out by ehsan for build failures: http://hg.mozilla.org/integration/mozilla-inbound/rev/cdef000532ce tree/layout/base/FrameLayerBuilder.cpp:2253: error: 'InvalidateThebesLayerContents' was not declared in this scope

Opps wrong bug, disregard that.