Which approach is good for creating a document viewer in WPF?

I need to create a document viewer in WPF.

• The document is read-only. This is not an editor.
• The document usually is very long and not paginated (meaning it is a long scrolling document).
• The document should be scrolled smoothly, even if it is large.
• The document control should not hang (unresponsive) while loading a large document (at least show "loading...", instead of freezing).
• The document needs to be word-wrapped when the user resize the window.
• The document may contain images and push buttons and hypertext links.
• It need to support folding like the Visual Studio editor.

First I tried to use the FlowDocument in .NET, but the performance was not so good when the document was long. If I create a document viewer control myself, is there any article or approach that I can refer to? I am thinking about drawing everything using Visuals on a custom control. Is this a good approach?