If you want you can disable this Start Screen animation. (thewindowsclub.com)
People have found out ways to enhance the start screen animations, add delay to various elements and stuff like that. (howtogeek.com)
The hardware upgrade is enough to keep home screen animations running smoothly, and to avoid the more egregious performance hang - ups that made certain apps borderline unusable with the previous Fire TV Stick. (techhive.com)