Per-entity materials suggested instead of the matproxy library

In #lua-help, full metal sergeant 228 asked whether there's a better way to do controllable textures, since he heard the default matproxy library is very slow, and noted LVS creates a material per entity. Artemking4 suggested instancing a material per usage from a base material and changing only what's needed. Asked by TankNut how slow matproxy must be for that to be the alternative, he said creating materials is "dirt cheap" because they are just containers for shader inputs.