Bottleneck When Writing .MOV Files Multi-Frame Render

I have been rendering some fairly simple GFX (basic text animtors, shape layers, 2k images fading on and off etc) for a 1920x1080 60FPS presentation wall to ProRes4444 + Alpha files.

Even when rendering to a fast scratch SSD from RAM (almost always dark green bar during render) or from cache, AE seems to hit some sort of speed limit at around 30FPS. 

Normally that's plenty fast, but some of these slideshows are 5min long comps, so a 5 min comp can take 10 min to output for 60FPS. My system is more or less idle while its writing from RAM and I am wondering what the limitation is that is keeping this from being a faster encode? ProRes 422HQ goes marignally faster but still tops out at around 30-40FPS 

Seems like the bottleneck is just writing out the .mov file but the disk write max I can get is about 40MB/s which is a lot lower than what the SSD can handle. 

@jenkmeister17177426 Any tips?

AE: 23.6.0 (build 62)

PC:

3960x Threadripper 24 core

2080ti

256GB ddr4 Ram

reading/writing to pci-e NVME drives.