Not sure what you mean, but it's running as smoothly on my 10.5 as iOS 13 was for me if that's what you're asking.
lol dont worry, i have it on my ipad 5th gen with A9 and its as fast as the day i got it with ios 10 (im also surprised)What I mean by this is Apple has a tendency to allow major iOS updates on devices about one major rev longer than is advisable and that last major version ends up making the device essentially unusable and slow. There’s myriad websites and threads discussing this.