How to optimize QTGMC deinterlacer for multicore?

Running a Core2 Quad, wondering how to get QTGMC deinterlacer to take advantage of this? I ran it and it's using about 30% of the processors.

What I've found looking online about this issue seems ambiguous.

Running AviSynth 2.6 build Mar 9 2013 per the version avs script.

Thanks.