Potential Performance Solution

I have previously experienced a lot of stuttering and poor frame performance/CPU lag during chaotic moments (erupting abyss, lots of corpses, shrines/ground effects, etc.). I tried almost every single graphic combination, and even found that restarting my PC would help in some scenarios, but nothing really eliminated HUGE FPS drops - and I mean I would sometimes go into legitimate slideshow territory, with less than 1 FPS, actually unplayable.

What I have done to fix it, and maybe it will help others:

Do not use Vulkan renderer. Switch to DX12.

All of my problems have vanished, and that's not hyperbole. All of them. I played on Vulkan in PoE1 ever since it was an option, and in PoE2 ever since 0.1 because I felt the performance was better than DX12. This is no longer the case.

My Specs:
CPU: 5800X3D
GPU: 7800XT 16GB
RAM: 32GB
Resolution: 3440x1440
OS: Ubuntu 25.10
Platform: Steam (using Proton translation so I can play on Ubuntu)

- I keep every graphical option on default where a default is specified.
- NIS, no upscaling
- Sharpness as low as it goes
- 16x Anisotropic filtering
- No dynamic culling
- No dynamic resolution

I will fluctuate between 60-120FPS, and there is no stuttering anymore. It's not like there isn't ANY performance drops, but it now stays in a playable range. I do not experience anything close to slideshows anymore.

There has been one instance where a monster faded in like magic upon entering a map soon after I switched from Vulkan to DX12. Haven't seen it happen twice.

Maybe this will help someone else!

sadly, but there is no universal solution for anyone. there are many threads that something works for some people , but that doesnt work for other people.
all we can do - experiment more and more.
ofc people should know PC basics to be able to set up hardware and software properly etc.

what helped for me for a certain amount is turning off undervolting CPU and GPU (14600k+3070ti). it has no problems in other games , but poe2 somehow had crushed here and there because of this. now i got MUCH less crashes, after i turned it off. ofc i have crushes , but it happens way less than before

i also tried to change poe2 graphical settings, but that doesnt affect much on crashes. i maxed fps but there is not such setup for my system to avoid stutters or fps drops to 20-40 in massive fights.

ps. vulcan doesnt work good for my system also. only dx12