I find the 64bit a bunch faster.
The only thing I discovered is that when prompted to update to the latest 0.9.9 version it took me to the 32bit download.
Of course I didn't notice this until all of a sudden I was back to 2 versions of calibre. And no the irony of someone not bothering to read when it involves a program designed for people who read is not lost on me :-)
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