Main files
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Low impact.
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Decent quality with no high impact.
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High quality texture that's used mostly for those who care about the overall scenery rather than the performance hit. Does this mean it has high impact on the performance? It definitely does not if you don't have a lot of high resolution textures.
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Some people simply don't care about the performance. Lucky you, I exist.
Optional files
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Parallax textures for ENB users.