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Start using the Steam version, the Non-steam version has little to no support and is generally very buggy.

Because of the mass of the NPCs, they can not cope with the NPC Nodes without extra nodes for the larger NPC class (Such as striders, choppers, gunships, etc.) Considering as welll that they are so large, the animations played to represent them walking, jumping, etc would be very consuming to total FPS possible.

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