Ah, now it's clear).
We just tried to get the most beautiful graphics using a minimum of resources, most likely the reason for this....
that's how you can fix it? :)
I'll see what can be done with this :)
If you have little FPS, then it's quite possible that the matter is in the video card drivers. I tested the game on a computer from 2010, there were no lags, and pretty decent graphics were observed, as it was planned...