Hello everybody,
I have a technical question for the experts in here:

I am developing an OpenGL application for iPhone using openGL 1.x .
When i render a big item on the device it become obviously slower and that's seem quite normal to me.
But i would have expected an increase of framerate when the object is highly zoomed in as the majority of the vertexes are outside the viewport's bounds.

I also try with glEnable(GL_SCISSOR_TEST)/glScissor(0,0,320,480) but the result is always the same?
This is really driving me crazy!

Why the not shown triangles are always computed(or why the speed remain the same while drawing a smaller portion of the object)?
There is a way to avoid this and subsequently increase the framerate?

Thank you in advance.