I wonder if there's something about the mobipocket format that makes it more functional for dictionary lookup. I bought the Pocket OED in mobipocket, which works quite speedily on my creaky old PDA. I, um, scrubbed it and experimentally converted it to EPUB to try on my PRS-700, and it's about as speedy there as a sinking barge. And this is a pretty minimalist dictionary. (I can't honestly recommend it, even in mobi format, due to its sketchiness.)
No doubt special coding will be required for a proper EPUB or LRF dictionary, but I was quite surprised by the lumbering contrast, even in a cookie cutter conversion. Forget using the 700's search function in this puppy.
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