Ok, I am wondering what the rule of thumb is for texturing some small 3D models. Let's say I have modelled four game objects. I want to use one 256x256 texture for each object. In terms of processing power in the game engine, which is Unity for this by the way, would it be cheaper to use four 256x256 textures. OR, I could put all four UV maps into each corner of a single 512x512 texture.?
Basically, is it easier for the engine if I use 4 smaller textures or one larger texture?