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I did not notice that severe CPU utilization, but I used a version or so back from what you are testing.

Sounds like you're putting it through it's paces though, good luck.

There was a way to...

Antigen works well. Their response to new viri is above average.
I like the performance of the engine. It also doesn't choke like some other scanners when you send a .zip file of 0 bytes through...