I've had no speed problems with over 2500 books in calibre.
People don't use Microsoft Office because it's faster; they use it because it's sold to them, usually by some hard-sell salesman at wherever they bought their computer. I've watched such a person telling a customer that it is illegal to use OpenOffice on a Windows machine so that he could get a fatter commission. I myself don't use MS-Office, but friends who do tell me that if anything, OOo is actually faster.
What metadata is it that you're looking for and can't find? For what books? I might be able to give you some pointers.
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