[computmaxer]

They nearly have done this already with "Low Power Mode", but unfortunately it seems they haven't committed to trusting the user to use this.

[nsgoetz]

Low power mode seems to turn off unnecessary animations and speed up my phone.

[kogepathic]

The first thing I do on any new Android phone I get is enable developer options and disable all animations.

I've had many friends complement my utterly midrange phone for feeling so snappy; it's because the stupid animations that only serve to slow down UI transitions are off.

[jtbayly]

Turning low power mode on or off makes no difference in this area. My phone runs at 50% speed, regardless of whether Low Power Mode is turned on or off.