QGraphicsTextItem vs QTextEdit/QTextBrowser

This question is pretty simple. What are the advantages of using a QGraphicsTextItem over QTextEdit/QTextBrowser?
Do I get major performance when rendering text (a lot of text)?

Also, are there any examples available so I could look how to use QGraphicsTextItem?

Thanks

The best way to answer this question is to create some sample/test projects yourself and do some debugging and benchmarking.

The question sounds simple, but it's far from simple to answer.