Unity - Upscale Sampling Optimization with Render Textures

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Upscale sampling is an optimization technique that intentionally creates a visual illusion by keeping the UI resolution high while slightly lowering the game's graphics quality.

Because the UI remains high-resolution, the perceived quality drop isn't that significant.

To implement this in Unity, you only need to understand Render Textures.

Render Texture - Unity Manual

To summarize Render Textures in one line:

You can represent what a camera captures as a viewable image in real time.

I created a very simple sample project and uploaded it to GitHub below — feel free to use it as reference.

cdw0424/UpscaleSamplingSample

-----------------------------Added 2020-10-15--------------------------

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Just in case, I tried changing the resolution of a pre-created Render Texture, but it reportedly doesn't work as shown above.