if you're reading pfd's then a big chunk of that is the pdf rendering time. Try a few lrf (native format) files. A pne second render is normal for e-ink, as I'm sure you know from even casual browsing of product and review sites.
I don't see any point in supporting more than 2GB cards, it costs money and is pointless. If you want to buy my 8Gb MSPD card I'll happily sell it to you for 75% of what I paid (looks vague, can't remember the actual number).
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