I think is more than this lightly increase blocks per unit for crops (if it was 3 I put 4, so nothing crazy). The textures are high resolution for most of the crops and the fields are very large... And if you have draw distance set high, it will render more crop blocks then usual...
Not trying to make excuse for myself, but I come from a 3060 laptop and all the games ran perfectly at high resolution, but farming simulator struggle to run smoothly at medium.
If you want to lower the blocks per unit, you can edit the xml. Tell me if you want to explain to you how to do it.