Originally Posted by flyash
Thanks dwanthny. I'll make the change to job priority and see how that goes before using the batch file.
The batch file is nice and has a lot of options but all you need to test is the last line. Run it from a batch file or from the command line.
START /belownormal Calibre
This will start calibre at a lower priority from the beginning and allow other apps priority. This means if you have a large number of books you want to convert calibre will allow you to do other things while the books are being converted. Of course because of the lower priority calibre will take longer to convert the books.