I'd say it runs mostly like it does on the iPhone 5s. And from what I've seen on YouTube so far, it looks very promising. May be not so perfect at this point, but I'm pretty sure it'll be good enough. Although it's recommended to wait for at least the next beta.
Hope this helps.
I have iOS 10 on my mini 2 and it runs really well for a beta. It does drop frames here and there, but that's to be expected in a beta. It's still plenty usable.
I didn't experience many frame drops on iOS 9 with my mini 2. Performance on the mini 2 with iOS 10 is overall worse than on iOS 9, but this is still the first beta.Does it frame drop as bad as iOS 9 does on a mini 2? iOS 9 made my mini 2 stutter a lot.