Yip... that was it. I deep dived to the bottom of the ocean... I had to fine-tune the virtualization... Ryzen 5950X has two CCDs, which means that moving processes from one CCD to the other has a cache penalty (among other things). This was creating some inconsistencies in the "virtualized clock ...

Humm... I think I found something interesting.

While playing on Fedora 43 KDM VM, I put a console window with "journalctl -f"

Just when Factorio dropped from solid 60 fps to anything between 20 to 40ish fps (depending on how busy the screen is) I got this in the terminal:

dic 31 11:55:42 f43vm ...

Indeed.

I started a few months ago to migrate everything to Linux based systems and building a homelab. Proxmox gives me lots of flexibility to move VMs around, take snapshots and complete VM backups that take 90 seconds (incremental and with deduplication with proxmox backup server). I also moved ...

My most sincere apologies... I am seeing above that I never explained this in the first place. Some of the tests above where done in baremetal, however.

I have been playing for a bit on a Pop!_OS (Cosmic, virtualized) and the problem repeated... strange... I had been playing on Pop!_OS (also ...

OK, let me try all day... thing is that I tried Pop!_OS (Cosmic, not KDE) and works perfectly... darn... this must be a very weird interaction.

I have also ruled out that virtualizing is not an issue (I use proxmox as the host and all my VMs are virtualized, but 1) Pop!_OS is virtualized and it ...

Oh BTW. I played all day with Windows 10 at 60 fps no problem. I do not think the GPU is faulty.

Humm... interesting. I think I am getting more information. Thank you!

This is nvidia-smi just when FPS started to drop.
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 580.119.02 Driver Version: 580.119.02 CUDA Version: 13.0 ...

This is nvidia-smi with Factorio running (I run factorio through Steam).
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 580.119.02 Driver Version: 580.119.02 CUDA Version: 13.0 ...

I forgot to mention that I start playing at 60 fps and sometimes after some minutes... other times after quite a while... it drops to 30ish FPS... After it drops to 30 FPS I have to system reboot to play again at 60 fps.

More info in case it helps:

Sun Dec 28 16:17:00 2025 ...

Thanks for the reply. Yeah... seems an interaction between KDE and Nvidia.

Note that I tried many other things, like installing the proprietary Nvidia drivers, starting the session with X11, forcing Factorio to use X11 (so Wayland might not be at fault here). I also tried compatibility layers ...

Hi all,

Love the game. I moved to linux recently. Under windows 10 it works great at 60 FPS solid. I have an NVIDIA 3080 ti and an AMD 5950 so plenty of power.
In F4 in Factorio, I can see the flip time to be around 3 ms... so well below the 16ms limit for 60FPS. The game should still work at 60 ...