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What I would do personally, is change how many of that texture are on that tile (just mess with the layer config and change the number for grass, with this map i would say make it higher, however I'm not sure what this would do FPS-wise
What it appears to be is him running it at low settings (256 textures) on a small resolution monitor, so its difficult to judge properly. Judging off the lack of a stable 30fps in the screenshots, it could likely be his PC really struggled with OMSI?