Still enjoying my S5. It really is a nice phone
Tweaks to get the most out your S5 (AT&T version)
Enable ART
Enable Developer Options
Disable all carrier bloat and Samsung nonsense
Change animation scale to .5
Force GPU rendering
Disable capacitive button lights. You know where to tap, even in the dark.
Set screen brightness to auto
Turn off any features you honestly don't use. Example: NFC, multi window.
Turn off auto app updates in the play store. Keeps bloatware garbage from being installed and activated automatically.
Add the active apps widget to your home and see when apps are starting to eat too many resources. When they become to much, open multi-tasking and close what you don't need.
Enjoy your device. Still not missing my iPhone 5S
That's pretty extreme. You don't need to disable the capacitive buttons lights. They are powered by LED which takes nearly no power to operate so your not saving anything there.
Auto update, even if it does update the bloat, it will still stay turned off. Frankly I've never noticed the bloat being updated when turned off.