I have a little app using lighting + depth test + textures then I added some blending function only to draw 3 semi-transparent quads. At a start I had 270 fps, if I only enable GL_BLEND it get down to 250. If I draw 1 quads using blending it gets down to 200, and with the 3 quads at the same time it gets to 94 fps! Is this normal? How can I optimize this?
Hardware: Pentium !!! 600, Winfast Geforce 256.