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Why the Current Dimension will not become smaller, what is the relationship between Current Dimension and mipmap?

I created mipmap texture(2048 * 2048) in PhotoShop, alt text

import to UE4 and works well. alt text

But the Current Dimension in the Statistics still shown(2048 * 2048) , same with the Max Dimension, I'm not sure if this is correct. alt text

This is my texture settings: alt text

In order to optimize the scene, how to set up to make the Current Dimension become smaller?

PS: I submitted this question because in some of other Demo files, I see some textures will be optimized, and they don't use LOD Bias, I think this is a good idea for optimizing the scene. alt text

Product Version: UE 4.16
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asked Sep 19 '17 at 02:44 AM in Using UE4

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