There's a fix for the CPU and RAM usage. Go to the Black Ops 3 folder then go to the "players" folder and open "config.ini" and look for "yes MAF the full game is 50gb its a massive file size of fps game ahaha also eating up a lot RAM
//Thread count for handling the job queue
WorkerThreads = "4" // 2 to 4" and change the "4" to a "2". Works like a charm if you are having CPU and RAM issues.