I’m using a Magic NS adapter with a dualshock 3 in Retroarch, and the sensitivity of the triggers seems to be wrong when mapping them to digital buttons. This is noticeable for ps one games that use all 4 shoulder buttons or any core where I want to remap the controls. The triggers require much more force than is necessary to get them to activate the corresponding button in game.
I can test this by using Joytokey and setting up a profile mapped to keyboard keys. I disable the xinput device in retroarch, and then map the retropad abstraction controller to the keys I set in the Joytokey profile. When I do this, the triggers respond much quicker because Joytokey is handling the analog to digital response.
It doesn’t seem to be an OS problem because the triggers respond very quickly when testing them in the Windows joystick configuration utility and in other applications such as Joytokey as just mentioned. Using a dualshock 4 with the adapter gives the correct response.