Rendering problems(maybe)?

The case: Sometimes(a lot of times) when I load into a map/town after the basic loading screen - the UI appears, but there is still gears turning on the red "sparks" background. I can run around the town, interact with NPCs, use stash and all other normal activities. But the "red sparks" screen and gears still "loading". It's not very long(around 15-20 sec) and it completes the load, but it's annoying.

I assume it's rendering a background and my CPU(i5-8600K) might be the culprit but...

...is there a solution of some sort to fix or minimize the occurrence of said screen? Or is it a game feature or my hardware bottleneck problem and I should bite the bullet?