however your phone is still perfect .....try too look into settings , first check your current display resolution , battery saver disabled, performance modeon highest, ram expansion on full, al graphics to high and all other apps closed, rotation on, check app settings for graphics or video or resolution.....and dont forget to restart thephone....you can also try updating the app and the phone and google update or delete app and reinstal he latest version of the app or even factory reset could help you so there are many solutions