I'd just be fairly surprised to see an SE run without any jitter in iOS 11. Out of the over 100 devices I've used with iOS 11, not one of them have gone more than 2-3 or so minutes on the springboard without exhibiting some sort of jitter or animation problem. All the iPhone SE's I played with through multiple stores over the last couple of days have done the same.
Thus why I find it hard to believe that any SE is running iOS 11 perfectly. My logical explanation would be that since the SE on a clean install jitters in iOS 11, that means all of them do. However this may not be perceived by everyone. I'm not telling you what your experience is, that is based on perception.
wait... you've checked 'over 100 devices'? and played with multiple SEs in multiple stores over the last couple of days"?? is this really what you do with your time? you drive from store to store checking the SE???
my life is much simpler: i am just using my phone. i'm a pretty straightforward, honest person... and i reporting what i am experiencing. if you expect us to believe what you wrote above, it should be even easier to believe i am telling the truth.