If you got fps drop in Call Of Duty ( COD ) , you have to turn off your channel in game or you can change it into ''Friends Only'' . It will help you to return your FPS and it's around 60 FPS you can receive. this was a bug in the last update and it cause all of the microphone were activated and let you FPS Drop ! you can test it ;) i think it fixed but no matter for test it once