nvidia framerate limiter mode

There's this program https://ci.appveyor.com/project/Orbmu2k/nvidiaprofileinspector/build/artifacts nvidia profile inspector, that allows you to change the registry entries of your nvidia drivers for different games/programs. One setting in particular intrigues me, its called "Frame Rate Limiter Mode"

Basically, when one sets it to either

"0.00000004 PS_FRAMERATE_LIMITER_2_CONTROL_DELAY_FLIP_BY_FLIPMETERING"

or

"0x00000010 PS_FRAMERATE_LIMITER_2_CONTROL_ALLOW_ALL_MAXWELL"

I get substantially less input lag in any game I set this for, without changing anything else. Does anyone have an idea why? This setting is unavaliable in the normal control panel so I assume its hidden for a reason. I've had this set across multiple games now and have yet to encounter an issue with it.