Lighter materials

has we all know the more materials we have the heavier the scene and file gets this means slower render times, slower viewport etc... My idea basically consists on instead of going manually viewing each and every texture/material and delete the ones that are similar we could have something like a "decimate" but for textures the blender would see trough rgb codes or by color the materials and textures that look similar delete them and replace them on the objects that had that texture this helps a lot on larger scenes that contains lots of textures thank you