"vtdecoderxpcservice" process high cpu with millumin

Hey I am experiencing crazy slow downs with millumin even running one or two layers with minimal fx. A peak into activity monitor is shows that "vtdecoderxpcservice" is sometimes taking upwards of 400% cpu and only seems to grow as the program stays open and then the videos start stuttering. Millumin becomes almost unusable. It happens with both .mov and .mp4 files.

I am running Mac Sierra 10.12.6 on a mid 2015 mbp