Bugzilla email_in.pl script will take 111 hours to complete - how can I change that?

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http://unix.stackexchange.com – I have an old Bug tracking system, with about 20k bugs. We have installed a new bugzilla system, and part of the initiation will be to import all the bugs from the old system to the new. I am able to use the email_in.pl process to read a file from an NFS shared folder (where I can save my CSV-->single files. email_in.pl format http://www.bugzilla.org/docs/3.0/html/api/email_in.html bug fields format http://www.bugzilla.org/docs/3.0/html/api/Bugzilla/WebService/Bug.html#C... However, while testing, each execution of the script takes rouglhy 20 seconds - rough estimation will be 111 hours f (HowTos)