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Generally SD cards are slow.
You will have slightly better results by selecting high speed SDHC cards.
The con is these cards are more expensive than regular cards.
Also these cards generally go from 4GB and up.
The good thing is they're a tad faster.
It's not really bad to have a 4 or 8GB card, but what is bad, is that you'll best only use as little of it as possible.
Since the more you fill the card with books, and pictures and files,the slower the reader works.
the larger the indexed archive of the card, the slower the reader works.
Also know that the reader possesses a 200Mhz processor;something we found in our pc's in 1995...almost 15 years ago.
Don't expect SDHC cards to be that much faster. Even amongst them there are many differences in speed. A Class 6 is generally the fastest class available, but even amongst class 6 there are cards that easily topple other cards by being 6 times faster.
(Eg: Sandisk Extreme III cards are reasonably faster than regular SDHC Class 6 cards).
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