Interesting... It seems though that I get much better performance creating (by hand) multiple jobs of 100, than doing a single job of 500 for example. It only runs one 100 job at a time, but something seems to slow down doing the large grouping of 500... maybe it's an illusion, but....
My given example of ExtractISBN not only does the 'expected' thing (give it 500, it makes 5 jobs of 100 each), but then it multitasks and will run multiple jobs at once... That was my expectation (and hope) for the main metadata downloader.
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