I read that it can improve the performance of memory usage with it but I do not find where to change this setting.
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Can you explain more about what you mean by downscaling?
Perhaps you are referring to the size of the spritesheet? If so, take a look in the "Properties" tab of your project, and scroll down to the "ADVANCED" section: construct.net/en/make-games/manuals/construct-3/project-primitives/projects