Hello,
I'm migrating from Plesk 9.5 (Centos 5) to Plesk 12 (Centos 6).
I found this in the migration.log file:
[24124]: 2014-06-25 14:27:20 DEBUG Unable to find 'pigz', trying 'gzip'
I've installed pigz from Plesk repository and I can execute pigz in the shell, but definitely Plesk...