FPS randomly slugging down to 10fps

Wasn't able to get an answer to fix my issue the first time, so I'm reposting with a bunch of updates.

I've been having this issue for a good couple of months now. When I first log into the game I'm always able to get clean 60+ FPS, but then I will get bunch of sudden spikes of slowdown during battle, flying in the overworld, basically anywhere, lasting for 3-4 seconds each, where I'm basically stuck playing FFXIV as a slideshow, complete with input lag as well.

This ONLY happens with FFXIV, I've never had this issue with any other game I own, including games with more intense graphics/with many players, and it's honestly been making my game nigh-unplayable for high-end content, so I'd like to know what else I could try to fix it.

Here is what it looks like happening. OBS does not affect my framerate in any way.
https://youtu.be/Nn602e-a_1g

I have already tried the following:
-Made power profile high performance
-Updated all graphics drives + restarted computer
-Lowered graphics settings (FPS stays the same regardless of where I put it)
-Switched between DLSS and FSR
-Checked for overheating (Its consistently at 44C)
-Disabled Vsync/Gsync
-Set FPS cap to screen refresh rate using all 3 possible methods
-Closed down all background apps
-Unplugged extra devices/controller
-Disabled all plugins and overlays
-Disabled fullscreen optimizations
-Disabled windowed optimizations
-Disabled Microsoft Device Association Root Enumerator
-Disabled Hardware accelerated GPU scheduling
-Disabled Discord's hardware acceleration
-Disabled Game Bar (to the extent I could)
-Replaced faulty charger
-Restored game files/integrity check
-Rolled back to 23H2
-Rolled back graphics driver

Specs:
Razer Blade 17 (Gaming Laptop)
Microsoft Windows 11 Home 10.0.26100 Build 26100
12th Gen Intel(R) Core(TM) i9-12900H 2.50 GHz
GeForce RTX 3080 Ti Laptop GPU (Razer Blade 17)
32GB RAM, DDR5 2500MHz
Samsung SSD, 1TB
Internet speed: 339.6Mbps download, 11.8Mbps upload