I have screwed up Normals from importing a mesh. I seem to recall a modifier or tool that rest all the normals to their correct alignment, but cant for the life of me remember what it is called. Poopinmymouth used it in one of his video tutorials many moons ago. It's not the normals modifier, that just flips or unifies them. It's called something else. Anyone know? Its driving me mad.
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Oh, also if it's a really heavy model it could just be the adaptive degradation that max has on by default for viewports.