Thanks for pointing out the unnecessary work.

Can I ask you about the idea that I can decrease the size of the list with each word? The problem is that I need to get the total similarity for each word to every other word. So I don't think I can decrease the number of comparisons per step without storing preceding results, but the memory demands are huge, even if I delete items from memory once they are retrieved.

But if you see another solution, please let me know. Thank you for your help!

In reply to Re^2: Mysterious slow down with large data set by jsmagnuson
in thread Mysterious slow down with large data set by jsmagnuson

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