Hi Jorge,
Today I saw commit 3626, and checked whether the pages I see to produce redraw storms and CPU hogs were gone, and... no :-P
I got one of them and worked reducing it to try to produce a good test case, that's the attachment. If you open it with embedded CSS disabled, it's OK, then enable it and voila: redraw storm and CPU hog.
I hope this helps the cause. Please let me know whether you can work on it, or give me some clues to try to start digging further.
Yes, I can reproduce the problem. Thanks for the test. This change (revision 3626) was for the opposite problem: in some cases, there is no redraw. It seems that I'll have to care about the TODO of the commit message soon: "Cleanup and document lastWordDrawn and redrawY!". I'll work on this soon, after an issue I'll hope to finish today. Sebastian