Single CPU Thread at 100% & "System" Process Spikes

Hi Respawn Team,

I’m reporting a persistent micro-stuttering issue in Apex Legends that has made the game difficult to enjoy. After extensive troubleshooting, I’ve pinpointed a specific behavior: one single CPU thread consistently hits 100% usage (while overall usage is normal). Additionally, the "System" process in Task Manager sometimes spikes above 20% during these stutters.

Interestingly, the CPU usage on that specific thread drops slightly when the mouse is stationary, but spikes back up immediately upon movement.

My Specs:
CPU: Intel Core i5-11400
GPU: NVIDIA GeForce RTX 3060 Ti
RAM:16GB+16GB
OS: Tested on both Windows 10 and 11

Troubleshooting Steps Taken (None have resolved the issue):

Frame Rate & Settings: Capped at 60/120 or Uncapped; Video settings toggled between Low and High. The single-thread bottleneck remains regardless of these changes.
Launch Options: Tested both -no_render_on_input_thread and -render_on_input_thread.
Drivers & Software: * Clean GPU driver install using DDU.
Uninstalled Realtek 2.5 GbE Family Controller.
Disabled all overlays (Discord, NVIDIA App, Xbox Game Bar).
Turn On/Off Windows Game Mode, HAGS, and Core Isolation (VBS).
Turn On/Off NVIDIA Reflex, G-SYNC, and V-Sync (both in-game and NVCP).
Added Apex/EAC to Windows Defender exclusions; Running game and EA App as Administrator.
Swapped different keyboards and mice.
Removed all unnecessary USB devices.
Cleared Apex/Shader caches and performed a clean reinstall of the game. Hard drive health and temperatures are all normal.

I’ve spent a significant amount of time trying to fix this,I really want solve this problem.I love this game.

If anyone has successfully resolved this specific CPU thread bottleneck, please share your solution! I would also appreciate it if the dev team could look into potential conflicts between the game's engine and certain CPU/Driver configurations or Easy Anti Cheat.

Thank you for your help!