Why does GluLookAt is more slow than his own matrice

Hi, Im french and I don’t speak very well english. I’ll will try to explain you my problem.

I’ve heard that GluLookAt wasn’t very performant. They said that to use it in a 3D game, it is better to make his own matrice projection. is it true and why?

If you call gluLookAt() once per frame, the cost of it is ENTIRELY lost in the background noise.

If you call it hundreds of times per frame, you should re-think your rendering strategy.