Winter Offensive update v1.1.3.0/v1.1.3.1 - keyboard + mouse stuttering/hitching

This is my 3rd update Winter Offensive update v1.1.3.0 and Hot fix v1.1.3.1 - I know its Christmas time so I don't expect a solution for this in the next few weeks, but I still want to share my issue (again).

I am under the impression that a lot of people are experiencing this, but don’t know how to troubleshoot and explain the issue appropriately – I mean that with all due respect. I just want this to get fixed because the multiplayer in its current state is not playable for me unless I use a controller – and I’m not going to do that.

Issue in detail (for the 3rd time):

Summary: Keyboard presses + Mouse movement = stutter/hitching effect. 

I’ve learned a bit more today. In the firing range (my testing area), If you combine keyboard button presses with mouse movement – you get the stutter effect. If you press 2 or more keys AT ONCE the stutter will multiply (long pause or hitching effect). This does not manifest as a frame rate drop/hitch – my frame rate in the firing range is at a constant 138FPS so the stutter/hitch does not appear in a frame time graph.

If I only use the keyboard – meaning do not touch the mouse – I held down the arrow keys to look left/ride and starting pressing random keys, sometimes 2 or 3 keys at the same time to trigger the stutter – nothing! its perfect! No issues. If I plug in a controller – works perfectly fine. Using a controller one hand and the mouse in the other hand = no stutter (the game allows for multiple input devices to be used at the same time, lots of games do this).

When I test single player Campaign (separate .exe file) everything works as it should – no stutter when using keyboard + mouse or just keyboard or just mouse or controller + mouse.

Note: Every time I start up the game, the keys that trigger the stutter change constantly. Its not always the same keys – so listing which specific keys cause the issue no longer makes sense – it keeps changing from run to run.

What if you isolate each input device?:
Mouse only - no stutter
Keyboard only - no stutter
Controller only - no stutter
Controller + Mouse - no stutter
Controller + Keyboard - no stutter

If I use the keyboard to look around and press any other key as well as combinations of keys at the same time = no stutter. To trigger the stutter you must move the mouse and press keyboard buttons at the same time. How the hell am I supposed to play well in a match if this is happening?

Solutions previously offered: 

• Signing out of Friends in Steam - does not make a difference.
• Turning OFF any overlay like RTSS / NVIDIA Overlay / EA Overlay does not help.

TL;DR: 
Multiplayer exe file:
Keyboard + Mouse = stuttering mess <---
Keyboard on its own = no stutter
Mouse on its own = no stutter
Controller = no stutter

Campaign exe file:
Keyboard + Mouse = no stutter
Keyboard on its own = no stutter
Mouse on its own = no stutter
Controller = no stutter

Only Multiplayer .exe has this problem

Extra info for my hardware/software configuration I provided for a separate topic - this may be relevant to solving this issue:

Mouse mode (wired or wireless)
    Logitech G603 (Wireless)
Mouse polling rate (e.g. 1000Hz)
    1000Hz
Whether you’re using mouse software (like Razer Synapse)
    Logitech Gaming Software v9.04.49
Where your mouse is plugged in (PC, monitor, hub, etc.)
    Mouse USB Receiver > USB Hub > PC
Keyboard model and connection type (wired/wireless)
    Logitech USB-C MX Keys Advanced Wireless Illuminated Keyboard
Keyboard polling rate
    500 Hz polling with a 125 Hz effective update rate.
Whether you’re using keyboard software
    No (Generic Drivers)
Where your keyboard is plugged in
    Keyboard USB Receiver > USB Hub > PC
Monitor model
    OLED48C4PUA, 2024 (LG 48-Inch C4 OLED)
Full PC specs (CPU, GPU with driver version, RAM)
    CPU: AMD Ryzen 7800X3D
    GPU: Nvidia RTX 4080 (Driver v581.80)
    RAM: 32GB DDR5 @ 6200Mhz
Full Windows OS version (not just "Windows 11")
    Windows 10 Pro 64-bit (10.0, Build 19045)
Whether Gsync or VRR is enabled
    NVIDIA G-Sync - Enabled for Windowed and Fullscreen mode
Full screen mode (fullscreen, borderless, windowed)
    Borderless
Which platform do you play on (EA app or Steam)
    Steam
Any overlays active during play (Discord, EA app, NVIDIA overlay, etc.)
    MSI Afterburner with RivaTuner Statistics Server, NVIDIA Overlay is OFF, EA App Overlay is ON
CPU and GPU usage percentages while playing.
    CPU: ~30%-60% during 16 player matches.
    GPU: ~70%-95% during 16 player matches.
Whether the issue improves with a framerate cap (e.g. 125 FPS)
    No - it does not improve with or without a framerate cap.