The thing is that I kindof hate writing rendering code so I'd like to avoid doing to much experimenting. I love the actual game development, just not the rendering. I'm only doing it because I need to hide my lack of art content. The existing solutions are either way too content driven or "impossible" to use with an existing game logic engine.
maybe some profile tools are good friends.(Pix, Intel:GPA, NV:Nsight, AMD:Perfstudio)
What are your personal experiences, what gave you boosts and what slowed things down?
in our project, the DP count and PS shader always hurt us.