こんなのあって試したらサクサクなった感じ


ADB Commands for Firestick Animation Scale Settings
Update: you should be using 0.5 instead of 0.0. See updated video above for changing existing settings quickly within ADB Shell Remote App.


settings put global animator_duration_scale 0.5
settings put global transition_animation_scale 0.5
settings put global window_animation_scale 0.5

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自分の設定は

settings put global animator_duration_scale 0.4
settings put global transition_animation_scale 0.0
settings put global window_animation_scale 0.0

デフォルトは全て 1.0