I haven't tested 7.1 personally. But, everything I have read about it says it's a noticeable improvement on the iPad. The jittery animations (looking at you five finger pinch to close an app) are fixed and it is supposed to be faster overall. Given how nice the hardware on the rMini is, it has to be the fact that iOS 7 was rushed out the door months before it was really ready for public launch.
I'd say hang on until 7.1 is released if you can. While you wait, there are a few YouTube videos out there that show the performance improvements on the iPad.