Slow client side dedupe with Data Domain

I've been trying to get this client-side dedupe working correctly.  I did get it finally after much tinkering and reading some other forum posts, but now I am noticing that it is very slow.  Between 500-700MB/minute is what is reported in backup exec.  That test box I am backing up is a VM, with 1 processor and 3GB of ram.  I know the process is working because on the test VM, the network load is low, and CPU hovers around 60% or so druing the backup.  Also, on the Data Domain GUI, I can see the connection to DD Boost from that test VM.

So, I'm not sure what the problem is here with performance.  I would expect 2,000MB/min or better using this.  Anyone else have sucess with the same situation?