What impact do draw materials have on performance?

My mod has alot of objects that have textures, some objects are using the same texture while others use different textures, In all I'd say I have about 70 objects with textures, I wonder if all of this can impact performance do to multiple draw calls, also many of my textures are big usually 1024 or 2048, the full size of all textures is 109MB I'm looking to reduce it but if theirs minimal performance gain I'll leave it