Apple’s tvOS for the new Apple TV takes a page from the UI design of iOS, adding motion effects that appear as you navigate through various screens. These are most apparent when using the Siri Remote, which will gradually shift the shading effect on the highlighted menu option or icon in the direction you swipe before actually moving the highlight over to the next option.
If you find this all to be a bit too much, or prefer a slightly more responsive interface, you can actually turn this off under Accessibility settings, in much the same way as on iOS. Go into the Apple TV Settings
menu, select General, Accessibility, and you’ll find the “Reduce Motion” option down near the bottom of the screen.