Some games I get bottom frag and get 3 performance bonus, some other games I top frag and don't get any bonus. How do you get performance bonus? no shot it's random.

so im a immortal jett main that played csgo before and was global. but i can play her. but often i wiff so hard with the knives any idea how to practice betteer with them. And also is it worth instalocking her. cuz i can never play her in...