I also use RNOpdf in Vamp, it works fine for me (Is slow on large documents, but i think this is to be expected due to limited cpu power?) except for one detail, when view mode is set to fullscreen and then i zoom into the document, when the document comes back to its normal size the zoomed document still shows (freezed in the last position) in the borders of the screen. I don't know if I explained the issue very well, my english is limited
Yeah, this is quite CPU intensive stuff, some PDF files can be slowish even on PPC.
The program still works otherwise but some leftover graphics on borders after zooming? I'll have to test more with slower systems if I can reproduce it... never seen that on my main setup at least.