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Let us say that all the software bugs are resolved and Cybook software can handle full PDF feature set. However, say a certain page takes 20 seconds to render on Cybook. Most would compare an eReader to a printed PDF or using PDF on PCs. Thus clearly you would consider Cybook's PDF handling to be deficient even if it didn't crash.
I am not familiar with the details, but I read here how Sony and DR seems to be doing some sort of combination of pre-processing and/or results caching to speed up display of complex pages. Could be wrong.
The point is simply that DR has both more powerful CPU and seems to have a more advanced rendering engine for PDFs. Clearly far more effort was invested by iRex into PDF handling for DR as compared to Cybook. Not that there is anything wrong with that. Cybook still works well and is a great value for the price.
Simply some comparisons don't make sense. That is all.
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