How quickly display big parts of text using QtWebKit?

[fromRussiaWithLove]

Hello!
Im writing a small FB2 reader and faced a problem: I dont know how quickly display big parts of text on the screen. I used QWebFrame::setHtml(), but it is very slow. Other FB2 readers can display any text (big or very big) in shot time in scroll mode (like an internet page)
Have you any ideas?)

[dangelog]

Which kind of text are you talking about? QTextEdit / QPlainTextEdit might be more efficient alternatives...

[fromRussiaWithLove]

texts with html. I parse fb2 file, then use html tags to make it formatted. Qtextedit is also slow, i have tried it.