why dont you make a resolution setting: lets say I want to play on 1080p: every texure2D or sprite will be set in 1080p maximum ( I'm assuming sprites work that way coz I don't know what the 100% are) sprites are images right?
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Actually, that's not how it works.
Sprites specifically render the images. The source images do not change resolution when you change your game's resolution. The game still has to load the full image, and then visually make them smaller.
Of course, there are ways to go about this such as making multiple images at different resolutions, but this bloats the file size to be incredibly large and would be a difficult system to set up.