Stuttering/Frametime issues with my CPU in only 1 game

Hi. I've had an issue come up with only 1 game, Roblox, where the game stutters like crazy. Looking at the performance graph I see my CPU frametime spike from 16ms to 1600ms+.

What I find especially strange, is that it doesn't happen on the Microsoft Store version of the application (which yes, could be a solution, but it's been abandoned and is extremely buggy to the point where it's unusable)
Secondly, this doesn't happen on any other game I play. Only Roblox, and it's narrowed down to be a CPU frametime issue. The other games I play are much more intensive than Roblox as well, which ranges from various VR games as well as AAA flatscreen games, and it doesn't happen there whatsoever.

Some things I tried:

- Uninstalling and reinstalling (including AppData folders)
- Performing a clean GPU driver install w/ DDU
- Use the max performance power plan
- Clean Windows install
- Tweaking NVidia control panel settings

Specs:
- i7 8700
- RTX 2060
- 16GB RAM
- Windows 11 Pro 22H2

Note that this only started occurring in September.
I've contacted Roblox about this and they are useless by giving me potential fixes that have nothing to do with my CPU in the first place, even if requested to do so.

I'm hoping to get this issue resolved.

Thanks!

*** Moved from Windows / Windows 11 / Gaming ***

:)