Question: iPhone Xs animation and scrolling stutter
I and several other Xs owners have noted a slight stutter in scrolling and the app-closing animation after a period of inactivity. For example, if you have the screen on with an app open and just leave it alone for 10 seconds, then either start scrolling or swipe up to close the app, there's a slight stutter in the animation. It only does this after a period of inactivity, and not if you're actively scrolling and using it. It also seems to only happen when there's a static image on the screen. A couple of forum links for reference: here and here.
Mine is a SIM-free Xs, 256GB. I set mine up as a new phone and didn't restore from a backup. Rebooting didn't help.
iPhone XS, iOS 12