Extremely long loading times of x/obj models

[hotdamndel]

I tried using obj models since available exporters run better optimization for these, but the problem is how the loading times become exorbitant in both Openbve and ObjectViewer while anything else loads them just fine (up to 10 minutes). I enable Load in advance (or the same lag will happen when switching cameras instead of loading screen) and this happens on both New and Assimp parsers (same effect with both x and obj)

Sample train: https://drive.google.com/file/d/1CDL09_MMBAvrDdr8dbKszefPRI-BSJZP/view?usp=drive_link