Stuttering/Freezing in Photoshop 27.9.1

This needs a little context, I apologise in advance. I've been using Photoshop without issue since I upgraded my PC in February, but about 2 weeks ago, Creative Cloud changed my default install location from my D: drive to my C: drive, and when I went to launch the program, it re-installed Photoshop on my C: drive instead, wiping everything I had on my D: drive (brushes, presets, plugins, preferences, etc). There was no option to restore what had been overwritten, so I uninstalled from my C: drive and reinstalled it back to my D: drive.

Ever since, I have been having HORRIBLE stuttering/freezing/lagging, particularly when I zoom in/out or while I'm painting with a brush. I've never had this happen before, even before I upgraded my PC. As this is a fresh install, I have no idea what could be causing this? I do notice in scratch disks, it still lists the C: drive as the startup drive. Could this be contributing to the issue?

PC specs: Windows 11, 32GB RAM (sits at ~70% usage with all my programs open), NVIDIA GeForce RTX 3080, Ryzen 7 9850X3D Processor, Photoshop is installed on an 2 TB SSD that's completely empty, with an additional 1TB SSD as a secondary scratch disk.

Attempted fixes: Enabling/disabling multithreaded compositing, disabled all tooltips, disabled flick panning, allocated 80% (20GB) of my RAM, ensured "Use Graphics Processor" is checked, setting priority as "high" in task manager, running as administrator.

Set history states to 50, cache level 4, cache tile size 1028k. The canvas is 3000px x 3000px @ 72ppi. Only plugin is PixelRec, but the issue was happening before it was installed.

Please help! I have invested a lot of money in my PC specifically to make Photoshop run smoothly.