M4A1 Sherman
The model has sluggish handling in viewport.
Ensure that the fuselage mesh has a subD level of 0 for viewport. You can check this from the Subdivision Surface modifier in the modifier stack.
How do I fix odd discoloration patches all over the mesh?
This problem is most often caused by the normal map being in the wrong color space. It should be in Raw, Linear, or Non-Color for best results. Ensure that all non-Diffuse materials are using one of these color spaces rather than sRGB.
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3d model tank sherman M4A1 4kpbr subd medium-tank high fidelity