Everything can easily be replicated in an empty project. Just having an enabled object with a Visual Effect component attached to it and selecting the VFX you wanna use causes a constant insane fps drop that makes everything unusable. This is completely fixed(other than a few warnings) by: Navigating to Project Settings -> Player -> Other Settings -> Disabling Auto Graphics API for Linux -> Replacing OpenGLCore with Vulkan -> Saving and Restarting the editor. This resolves fps issues in both the editor and the build. I should mention that I am on gentoo Hyprland which is known to have performance related issues but this seems like a Unity thing. I provided a few screenshots of the warnings I was getting, last one being the ones you get at build time with Vulkan. Thanks Mao from the Unity's Discord server for suggesting the fix.