If you have the MK802 II, I had similar issues until I upgraded to the latest firmware. Now it's much more responsive. That's why I'm buying Rikomagic again because at least they make updates to firmware.
I haven't tried Bad Piggies (sounds like a knock off of Angry Birds?), but it wouldn't be too far off to think of the MK802 II as a equivalent of Galaxy S1 and MK802 III as a Galaxy S2.