1- Take one of the most advanced and optimized engines in the world

2- Discard every single specifically created tool for that engine

3- Assume that somehow every technical choice made in the building of that engine is wrong

4- Now your "engine" runs at 20 fps in a scene with a plane as a floor and 2 lights

5- Make an statement saying that, with some luck, the engine will eventually run as good as before you touched it

I am seeing some kind of issue here, but i don't know i'm just a boy