at what resolution? i'm only guessing based on your screenshots which are 1600x900 - @1080p that's over 25% more pixels to push
and if you have multiple monitors thats even less performance
i don't think you can generalize and say 'below card X the game needs r.screenpercentage' without specifying so many other factors (including AMD vs Nvidia)
i'm not discounting the idea that there's some program/setting on my system that's causing the stutter, but the fact is that i can run other games from similar eras that look a million times better, a lot smoother than i can run midair
so i stand by my original opinion that midair is poorly optimized, has limited tweaking, and imo ue4 is probably not an ideal choice for a game as fast paced and big as they're trying to do with midair
fuck, i'll even say it - Tribes: Ascend looked wayyyyy better than Midair currently does, and it did it more efficiently (using less CPU/GPU) than UE4 ever will