My own experience:
- Embedded fonts in LRF do slow page turns somewhat, about 1.5 lines of reading vs 0.7 lines (that is, how far before the end of the page you need to press the page button). This is for all text in one font and a simple font (more fonts might require flushing the font cache?)
- PDF: Noticeable slowing, and gets much worse as you process through the document. This starts to become an issue after a few hundred pages, and the document is essentially unreadable after 500 pages. Don't know if this is the fonts or PDF's in general. I've also seen a hard page limit of 1000 pages, but have been unable to get anyone else to confirm this.
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