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Texture streaming uses and purpose

Can any render experts chime in, when and why would you enable texture Streaming?

I understand that it enables more efficient use of memory.
Does that mean it is primarily useful when targeting mobile platforms and if you are targeting desktop you can safely ignore?

no, it means that you can set up a memory limit (budget/pool) and it will load textures or lower versions of them (mips) within that budget.
a very crude example would be if you have 10 textures of 1 mb each and your texture streaming budget is 9 mb then one of the teture will load at the highest mip i.e lowest resolution.
of course in reality its much more complicated because it’s algorithm is distance based and frustrum based and probably factors in other things…

If you dont need to change it, do not touch it.