Thanks for all the replies and suggestions! After I posted it did occur to me to write out direct to file instead of using the mergedlogs intermediate variable and that had a huge speed improvement. I ran both versions, and the original is still going after 16 hrs, whereas the improved version finished in about 30 minutes. I'll investigate the other suggestions too.

In reply to Re^2: Write large array to file, very slow by junebob
in thread Write large array to file, very slow by junebob

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