Thank you for the feedback! I used something called HISMs for the blocks to mine which helps a ton with performance but I didn't realise that Unreal's size of the array, that holds all of those duplicate meshes, would cause stutters even when you would have the direct index from a line trace. Although the performance is crap, this game jam helped me look into chunk based systems that games like Minecraft use which would allow a HISM to not go through 100,000 items but instead 10,000 or something like that.