Thanks for all the suggestions. I have checked all of them, with the exception of disabling a bunch of BG apps. I know, I have a lot running but never been an issue and nearly all are essential background apps. There's no CPU Throttling, MS Game Mode has always been OFF. Power is set to MAX Performance. Also, this is a Desktop, no power supply (with the exception of my CyberPower UPS). Nothing has changed, nothing has updated and no settings have been changed. The in-game settings have no fps cap enabled, v-sync is disabled as always, didn't accidentally turn on SS 2.0 or something, all graphics settings are as they were, maxed with the exception of SS set to default of 1.0. It's odd, but changing the graphic options in game have NO effect of framerate or laggy stuttering, it's as through the game doesn't even see that I've changed the settings, except I can SEE in the game that the settings have been changed, like LOW looks horrible, so I know they are working. I have yet to go into game today, maybe it's back to normal but... we'll see. Thanks again!