Low frame in game

Good day! I downloaded the program and added a third-party game, and here’s the problem, it seems to be running, but with a very low framerate (about 2-3 fps), so I want to ask you if you’ve had such a situation and how did you solve it? (If that’s the game: The Witcher 3)

no i have not had such a situation with the witcher 3

and what do you mean by “added a third-party game” ? is this is a cracked copy of the game ?