So some textures seem awfully low-res. I assume that the VT cache size settings controls texture quality? It's set on Ultra, but some still look pretty bad. Does this game have a known bug/issue with texture quality?
Also, it seems every time I move my view to a new area it seems like the textures are streamed in too slow. As in: I can actually see the half-loaded texture while playing and it's really visually annoying. Would installing to my SSD do the trick?
One of the downsides of idtech5's megatexture tech is that it costs a lot of storage. Most textures in any given area are unique, so to keep it manageable, they keep data beneath 50 GB.
This unfortunately means there are quite a lot of low fidelity textures that don't look good up close. There's nothing to be done about that.
The texture data is streamed from your storage through the PCI-E bus to the GPU. Be sure that the GPU is in a PCI-E slot running at the highest rate possible for your system.
If you're seeing textures load in, then you might also have to adjust the vt_maxppf setting. This controls the max number of virtual texture pages per frame the game tries to process. If you're GPU limited and this value is set too high, you can sometimes see textures being loaded. Sane vt_maxppf values are between 16 and 64. I think this can be set in the menus.