4 Physical Cores, 4 Virtual running at 4Ghz with 4 Gigabytes of VRAM in a Radeon R9 395X and I’m encoding a 4K video and for some reason, the system is only 30% utilized in CPU and 5% utilized in GPU:

Why doesn't Final Cut Pro take advantage of all CPU / GPUS?

Why doesn’t it utilize everything I have? This is a 1st party application on the fastest Mac you could get (as of 2 weeks ago before the iMac was refreshed).