Acccording to folks on the Kenshi Facebook group (yup, there is one) these two mods will greatly improve both loading time and frame rate issues. They are only on Nexus, not the Steam workshop (a decision of the modmaker).
I’ve installed both – the first overwrites much of the game’s original textures, the other is just a mod. Both installed easily and I’ve had no problems. Haven’t seem tremendous gains in load times, but I already have an SSD so it wasn’t terrible to begin with. Definitely better FPS. Others, both on the nexus and FB sites, report big gains in load times.