the FPS is one of the most important figures.
To assess the quality of the engine, you need to test
it on the average customers machine, when the game gets shipped.
So it is always valid to ask how it performs.
The other thing is, that in an actual game, more than just the grafix of this
one level is beeing processed...
I dont really have a computer that runs these new engines, so I can not
test how it is compared to other engine demos..