Slow Loading times and missing textures

I've had this issue for some time now. It's generally the worst when I first load POE and improves slightly the longer I play. I've tried reinstalling POE, deleting shaders, changing graphics settings, removing MTX, and even replaced my graphics card. I don't have this problem with other games like BG3, Elden Ring, etc. I'm worried this issue is going to bleed over into Path of Exile 2, so looking for advice on how to resolve it.

My specs are

Intel Core i7-7700k @ 4.2Ghz, 4200 Mhz, 4 core

AMD Radeon RX 7900 GRE (replaced NVidia 1060, had the same problems with both graphic cards)

Z270 SLI Plus Motherboard

48 GB RAM

SSD drives

Here's a video of me logging into the game and running one map. You'll notice that the portal graphic takes a few seconds to load, many textures are missing from the ground, some enemies are invisible for a few seconds, the effects on some enemies don't show up, etc.

https://www.youtube.com/watch?v=aC2-P7A6GrY

I've been troubleshooting this for awhile, and I think I finally found a fix. Disable Engine Multithreading in POE settings. Performance is so much better. Based on that, I'm going to say I need to upgrade my CPU at some point.