"There is absolutely NO memory difference when using external textures. But usually it's better to use external textures, because they are easier to change and you can share the same texture between different models."
And thats essential, only with this u are able to load levels with much entitys fast enough. I think its also important for rendering, thinking about clonig rendering techniques.
I was talking about different models. If you create the same model over and over again it's still just loaded one time.
