Is my reading correct that the lag/sound issues are occurring in tandem with firing your weapon? Does this still persist after a full reinstall?
I'll be closing this thread now for toxicity, trolling, and flaming.
As a reminder: calling other players shills, or otherwise implying that they are paid by Ubisoft to hold/profess their opinions, is considered trolling.
The forums are for feedback, discussions, and conversations regarding the game - not for accusations and attacks.