Well, it's definitely not doing the same thing as Extract ISBN.
If I Extract several hundred books the update process is less than 30 seconds.
If I Count several hundred books the update process slows down to less than 10 books/minute and Calibre's memory usage climbs rapidly throughout the update process.
Edit: If it makes any difference, I was only doing a page count, the word count custom column was left blank.
Last edited by capnm; 06-19-2011 at 03:18 AM.