I have encountered bad browsing experience in websites such as www.soyacincau.com and www.autoblog.com which have no issues rendering using Firefox.
The two websites have two different issues
For the one under www.soyacincau.com - zooming in and out lags alot to the point of it being unresponsive also occurs during the process of holding on a particular text to copy and continuing off with browsing.
In www.autoblog.com however, browsing is not of an issue. but it is the rendering of the pictures. Main page can render everything but when you go on to other pages, texts load but not pictures.
Again these 2 issues are not found when using Firefox.
I am not sure about other sites but for these two which I frequent visit is a problem.