Well, the Baen Free Library all by itself is well over 1GB of books if I remember correctly, and might even be over two or three... And I've been reading on mobile devices since the original Palm DOC program, so that's a lot of files...
I run Calibre on multiple machines, a Core2Duo WinXP, a Core2Duo Macbook and an AMD Athlon Vista machine. I haven't tried a Linux version yet (tried to build it, but man oh man it has a lot of dependencies).
I find Calibre slow on all the machines that I've tried. Maybe my expectations for user responsiveness are too high, but I tend to think that even if the underlying operations take a long time, the UI should still be snappy because it really doesn't do all that much.
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