[2020] Game Freezing / Stuttering when shot by Players? Just me?

There are different factors to consider to determine the cause of this issue. Since it's been a while since you last played, have you recently updated the driver of your graphics card? If yes, try to install a different graphics card driver version. In addition, try to run the game as an Administrator. You should not see such drastic change in lowered performance within this period of time. Something have changed on your side.