Copression and Loading Performance Problem

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Copression and Loading Performance Problem

Hi eveyone,

We updated our Teradata to 13.10 Teradata Version .Compression affect our loading jobs.In early version we load our data in 3 hours but now it can not be completed in 15 hour.Sometimes it seems in PMON in as running (Active) but sometimes it seems idle.I'm changing its priority as $M or $H but still same.Does compression affect laoding performance as much as this.

Thanks in advance for your helps

Regards.