My issue with DayZ started a few days ago:

Whenever I input any kind of "command" while running DayZ, I get ridiculous amounts of latency. I use the term command pretty loosely because it's almost as if ANY input freezes things up. For example, when on the main menu, I experience a 2-3 second delay from me clicking a tab to the game responding. This applies to just about everything GUI based; clicking "ok"s, clicking settings, scrolling down a menu, etc. This same delay also seems to apply to IG commands, as when I finally log on to a server, tapping "W" to walk forward causes a stutter. The longer I hold down W, the longer the freeze lasts for. For example, if I quickly tap W,A,S,D, after a 1 second stutter my character appears or warps to the appropriate distance. If I hold down a key for, say, 3 seconds, the game literally freezes for around 10-15 seconds until I finally "appear" in the direction I would have arrived at normally for holding down a directional key. Strangely enough, these freezes seem to only come about when press a keyboard key, or click my mouse, but moving my cursor around doesn't cause any issues. This applies both to navigating menus as well as looking around in game (when I first load in a server, I can use the mouse to move my view around without so much as a hiccup, but the second I try to walk or even hold down Alt to freelook, the freezing happens).

I'm really at a loss, I've never encountered this issue before, and today I've run several different games, most of which pulling more CPU and GPU resources than DayZ, and they are running perfectly fine.

Things I've tried so far:
Verifying game cache integrity of DayZ via Steam
Completely uninstalling and re-installing DayZ
Various edits to my DayZ config; the issue remains across the entire display spectrum, from the lowest settings on 800 x 600 to the highest on 1080p
I've searched online for solutions using keywords like "DayZ input latency" or "DayZ keyboard lag" but I keep finding solutions pertaining to generic performance tweaks for FPS milking. The closest thing I found were a few threads talking about mouse lag. Even though my mouse seemed to be the only thing NOT stuttering for me, I gave it a shot anyways but it was just more of the same DayZ.config editing.

The game is essentially unplayable in this state