I have not had any problems with RTF, LRF, or PDF formats.
One of the LRF books had over 5,000 pages and had no speed problems at either the start or end.
I created a properly page-sized PDF of 1,800+ pages in Adobe Acrobat and had no slowdown. I repeated it in ABBYY PDF Transformer and again no speed problems.
All of these were done using internal memory.
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