Multi Core Utilization Problem

I have a strange problem. I'm running an I7-3770K with Windows 7 64 bit and I'm using AVS Video Converter to Encode DVDs. If I run AVS by itself it runs slow and takes about 45 minutes to encode a DVD, only using a single core and a couple percent of the cpu. If I start using another program at the same time, even an internet browser, it speeds up tremendously. AVS begins using multiple cores and utilizes around 50% of the CPU. Its encode time drops to about 8 minutes. What could be causing this slowdown when it is running by itself??? I disabled Core Parking and that didn't help at all. Any Ideas?
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More about multi core utilization problem
  1. There is an explanation of this HERE . I use the program myself and have noticed it at times and at others not so much but have chalked it up to how the software is written. Beggers can't be choosers I guess.
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