Hello! I am first time iOS user and my first iPhone ever in my life. My phone came with iOS 14.6 out of the box. I noticed stuttering in Instagram after some time when scrolling, like the FPS drop to 30 instead of 60. I upgraded to iOS 15 beta 3 and the Instagram stutter problem is fixed but I notice some animation lag happening when I open the Phone App or Message App, or when opening the App switcher, also I noticed there is some animation lag when showing the running apps in the background.