For the new Unity Input System what's

[junior pawn]

#🖱️┃input-system exists btw, but they are defined by whatever interaction the action has

for a regular button input, yes started and performed happen at the same time

for a joystick for example you will only get started when you go from 0 to nonzero, but you'll get performed for every change in actuation

or for hold interaction you'll get performed only after the hold time

it depends