Android: Android's developer options have a few handy tricks, including the ability to make Android's animations go faster. However, you can only use 0.5 normal speed or nothing (unless you want to go slower). If you want to adjust them to any speed you like, you can do so with a few simple adb commands. Changing Android's animation speeds can make your phone feel faster without really changing its performance much. If you have ADB installed, you can change your device's speed to any fractional speed — measured as any non-zero value between 0 and 1 — with the following commands:
settings put global window_animation_scale 0.75
settings put global transition_animation_scale 0.75
settings put global animator_duration_scale 0.75
The first command will open a direct shell terminal to your device so you can issue the last three. These commands each govern a different type of animation. You can tweak one or all of them individually.
Keep in mind that animation speeds are usually chosen the way they are for a reason. While a normal animation might only take a second or so for you, app developers often use that time to load important information when you launch an app. If apps start to behave wonky after you do this, try turning down the animation speed again. Check out Android Police's full guide below for more information on how this works.