Developer mode

Settings /about phone/software information
Scroll down to 'build mode'
Keep tapping that until it says developer mode turned on (about 7 taps)
But only do this if you know what you are doing.
Any changes could seriously screw up your nice new phone

Where do I find it? I want to turn it on?
 
My set up:
Aggressive wifi to celular (I have unlimited LTE plan)
DISABLE ABSOLUTE VOLUME(that's most important)
Animation scale 0,5x
Force Gpu to overdrive
Force GPU to render graphics
 
@up
It lets free volume to Max level, ignore secure vol invented by producer. Just your BT headphones, speakers, car audio etc play as loud as its own technical limitations
 
GPU is more powerfull than CPU and phone is faster and more battery efficient with these settings toggled on
 
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My set up:
Aggressive wifi to celular (I have unlimited LTE plan)
DISABLE ABSOLUTE VOLUME(that's most important)
Animation scale 0,5x
Force Gpu to overdrive
Force GPU to render graphics

Been using developer options for years and I've never seen a setting called "force GPU I to overdrive", have I been missing it all this time, or is it a setting that is new to the Note9? I'm still using Note 8 and I have no such setting.
 
First is
Force GPU rendering
Second
Turn off hardware overlays
Always use GPU for screen compositing
Second option must be turn on after every reboot, it switches off everytime you power off your phone
I don't use third GPU tweak, as called turn on 4x MSAA sth antyalias for graphics but makes stuff looking to soapy to my eyes