Virb Edit Rendering is SSSSLLLLOOOOOWWWWW

I'm not seeing any significant pressure on my CPU cores or GPUs and exporting a video at 1080P from my older Virb is so slow. Is there anything that can be done to speed this up?

CPU: Intel i7 8700k @ 4.7GHz
RAM: 64GB @ 3200MHz
GPU: 2 X 1080Ti