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[ZacD]

Using a capsule around the base would likely be the best option. Unless the player colliding with more than just the trunk is a concern....

[ZacD]

GPUs do run hot, personally I aim for 80c max. To me, it sounds like either your computer case or Palit RTX 3080 has awful cooling. I'd try running without...

[ZacD]

You can try enabling use full precision UVs on the static mesh.
UE4 uses half precision (16 bit) by default to save memory....