this is 100% mouse hardware related, have not found a fix yet but one interesting fact that anyone can test them self is that when the stutter starts, if you have a xbox one controller hooked up, grab your controller and look around, you will notice it is butter smooth with 0 issue, go back your mouse it stuttery, back to controller butter smooth, so it has to be hardware related ( maybe its console-litus ) i tested this while still in clan so it not clan related, that has to be some other bug maybe a memory leak, this issue seems to be happening to everyone, after playing for about 15 mins or doing a PE even though u have 100 fps looking side to side is a stutter slide show, only fix is to restart destiny , but like i said grab a controller when it happens you will see for your self, this needs to be fixed, as i dont what to play with a controller for the game to be butter smooth btw my system is a 4670k 4.5 ghz 16gb and a 1080 ti on a 1440p gsync display