Zoltan and Holger, thanks for your answers. After some investigation, I found that the leak happens in FontFallbackList::fontDataAt() function. This happens during building rendering tree.
Since I am using QWebPage and QWebFrame directly without QWebView (I don't need displaying) , I suspected that the rendering tree is not deallocated correctly in this case. After changing the value of Document::m_createRenderers from true to false, it looks the memory stops growing fast. although it is still growing very slowly, but this growing is at a much more reasonable rate (12M after loading www.cnn.com for 200 times). I am currently pretty happy with this. If this slow leak turns out to be unacceptable, I guess I will try QT 4.5.2 then. Regards, Zongheng
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