in my laptop i have a 1060 + 6core cpu and on my second pc a r470 + old dual core I3I just go by what I experience. Every rpg maker game my computer seems to hate. Stuttering, slow, etc
Every unity game my computer seems to love. Smooth high fps.
I guess it depends on how they code it. Most rpg maker games that are visual novels I have no problems with since its just pictures. Even if they add some slight animations and effects, it doesn't effect my fps much.
edit - I suspect people with a 1080 gpu or 7th gen process won't feel/notice a thing either way. But the more smooth this runs on a lower end pcs, the more sales.
on both of those it runs fine as long as i force windows into high performance mode.
i do hate renpy games as they are just a click as fast as possible games without a skip button.
i even have a macro to do this as otherwise i would where out my mouse.