Performance drop in orthographic mode

I’m writing a 3D Fist Person shooter game, and the FPS drops from 30 to 10 when I draw lines and points in orthographic mode. Drawing texture mapped quads in orthographic mode runs fine, but anytime a primitive is drawn, the FPS drops. Help!

Most video cards do not support accelerated rendering of lines. That is why they do not work good under 3dsmax hardware mode for example.

Only the CAD targeted video cards like Nvidia Quadro models and ATI FireGL models will be able to render lines as fast (or faster) than polygons.

Thanks for the prompt reply.