Now break out the profiler and check where you are bottlenecked, and if you have the time & possibility, check which commercial or open-source rendering engines you did just beat if you replicate the same scene using them
Naturally, this does not have direct real-world applicability as usually there are many different objects, materials, lights etc. in a scene but still it should show the raw upper limit of your rendering code's CPU throughput. Personally, this helped me identify cache miss issues in my own code that would otherwise have gone unnoticed.
