LogInExtremely lightweight materials with no quality loss.
Take a look at a pack of 121 high-quality materials for Unity projects. These are said to be extremely lightweight with no quality loss. The materials are presented in Substance format (compatible with all Unity versions).
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The pack allows you to set the resolution of your choice. The ‘Ultimate Material’ set also features special materials with customizable parameters.
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What is more, the author is working on the future updates with new materials. And yes, you can request a material.