Improving performance

Game performance on Linux varies from game to game. Some games run better than on Windows, some run worse. Generally, you should be expecting about the same performance (±5%). If your experience is much worse, there is probably an issue. But even if your performance is already good, you might be able to get an even better experience - maybe even significantly better than on Windows (depending on the game, and on the hardware). You'll probably be fine if you do all major tweaks. Everything else is not as important if you just want something that works.

Major tweaks

These are the important tweaks, they will give a huge boost for all games. You should do all these tweaks, otherwise you will not have a good gaming experience:

• Disable composition.
  • You don't need to do this if you use Gnome (the default on Pop!_OS)
  • You only need to do this if you use X11.
• Use GameMode
• Install the correct drivers
  • If you don't have an Nvidia GPU, you likely won't need to do this. But if something is not working, just try it.
• Look at your thermals, and if they are too high, adapt the fan speed.
  • There are tools to do this inside Linux, but it's probably easier to do it in the BIOS.

AMD/Nvidia specific

AMD

It's probably worth doing, but if everything is fine and you think this is too complicated, you can ignore this section. However, they can make quite a difference in performance, depending on the situation.

• You can use CoreCtrl to add performance profiles for your games, set fan speeds, and overclock/undervolt. You can also set CPU performance here, it will overrule the GameMode settings.
  • The default is probably fine for most games, but it might make a big difference for some games. For example, if a game has a capped frame rate, the GPU might not clock to the highest speed which will result in sub optimal performance.
• There are two Vulkan drivers available for AMD GPUs: amdvlk and vulkan-radeon (RADV, MESA). The vulkan-radeon (RADV, MESA) one is the open-source version and is preferable due to better performance in most cases. It should be the one that is installed as default, so usually you would not have to do anything. But if you experience sub-par performance, check which driver you are using.
  • On Arch and Ubuntu based distros (for example Manjaro, or Pop!_OS), you can check which Vulkan implementations are installed on the system with this command: ls /usr/share/vulkan/icd.d/. It should say radeon_icd.x86_64.json. If you have the 32bit version installed, it will (also) say radeon_icd.i686.json. There might be others (intel for example), just be sure that there is not amd_icd64.json. The system will use amdvlk by default if both are installed

Nvidia

This page needs work, for the following reason(s): Not complete, and most is just copied from a reddit post. You may find better information somewhere else, I really don't know as I don't have an Nvidia GPU. If you have experience with Nvidia, and you know how to simplify this guide, please do so, maybe split the tweaks in important/less important or so.

• Use DKMS. DKMS is a prerequisite for using custom kernels like Zen, Xanmod or tkg with the Nvidia driver. It also lets you update to newer kernel versions without waiting for an Nvidia driver update. Every distro that has proprietary Nvidia driver support offers a DKMS version.
• The Arch Wiki is the best place to start. Enable coolbits as the link explains. Good is, setting the coolbits value to 28 on anything currently supported (post-Fermi) to enable full control over the GPU (at least, as much control as you're allowed to be given).
• Use GreenWithEnvy for overclocking, setting power limits (raise or lower) and fan curves. It's the closest alternative we have to MSI Afterburner.
• Make sure to use a Proton version of 6.3, Experimental, Proton-6.21-GE-2 or later for Proton-GE and Proton-tkg/wine-tkg-git of 6.17 or greater (or build your own) for DLSS support. For Steam, you need to put PROTON_HIDE_NVIDIA_GPU=0 PROTON_ENABLE_NVAPI=1 %command% in your launch options (side note: there should only ever be one %command%).
• For non-Steam games, use the latest lutris or wine-ge-custom build, with Lutris, and make sure to toggle on DLSS support in the Configure -> Runner options menu. For non-Steam games, you also need a dxvk.conf file with dxgi.nvapiHack = False in it. You can just create one (mine is ~/Documents/dxvk.conf) and set DXVK_CONFIG_FILE=/path/to/dxvk.conf in your /etc/environment.
• For Arch-based distributions, use TKG's nvidia-all repo, with _dkms="" set to true in customization.cfg.

Minor tweaks

These will not make a difference as big as the major tweaks. It might give you some FPS, or lower your input lag, but you don't have to do these tweaks if you think this is too complicated.

• Enable Fsync. You need to use a compatible Kernel (like zen, tkg-pds, or Xanmod; kernel above 5.16 is compatible with F-sync out of the box), and enable it in Lutris: Right click the game -> Configure -> Runner options -> Enable Fsync
  • If you can't or don't want to install a kernel that is Fsync compatible, you can also enable Esync. The performance boost is usually not as large, though.
• Install an optimized kernel like zen, linux-tkg-pds, or Xanmod. This will also prevent the system from becoming unresponsive when under heavy CPU load.
  • linux-tkg-pds (linux-tkg with PDS scheduler) seems to perform better than zen, and has lower input lag (this is definitely noticeable in competitive shooters). Some people recommend using linux-tkg-bmq (linux-tkg with BMQ scheduler) to get more consistent frame times. You can get it from chaotic AUR (list of available packages). To get all benefits you have to compile it yourself, though.

Optional

These tweaks come with some drawback. You might want to apply them, but maybe only for some games.

• If you don't get enough FPS, use FSR. This might dramatically improve your framerate in GPU limited games but will definitely hurt the image quality.
• Environment variables:
  • DXVK_ASYNC=1: Display frames even if they are not completely rendered. This will reduce stuttering a lot, but might trip anti cheat! Your wine version needs to be compatible or patched to use it. Proton-GE is compatible.
• To lower your input lag even more (after doing all major and minor tweaks), you can disable page flipping (this will result in more tearing). This only works on X11, but if you care that much about input lag, you shouldn't use Wayland anyways.
  • For AMD GPUs, create the following file: /etc/X11/xorg.conf.d/20-amdgpu.conf with the content:

    Section "Device"
            Identifier "AMD"
            Driver "amdgpu"
            Option "TearFree" "false"
            Option "EnablePageFlip" "false"
    EndSection
    

• Use LatencyFleX (warning: may trigger anticheat): Similar to NVIDIA Reflex (but works with AMD and Nvidia). Lowers input lag. Manually frame capping your game (so that your GPU never exceeds 80%) should be equally good. (If you use MangoHud to do this, this might add additional input lag!)
• You might want to have a look at the extensive Arch Wiki page.

Only AMD

• Environment variables:
  • RADV_FORCE_VRS=2x2: Variable rate shading. This will improve performance, but reduce quality of shadows. Alternative values: 2x1 or 1x2 to use VRS only in one (x or y) direction. (TODO: which is which?)
  • RADV_PERFTEST=sam: Force enable resizable bar/smart access memory. Might improve, but might as well reduce performance.
  • RADV_DEBUG=novrsflatshading: disable VRS for flat shading (only on GFX10.3+)
  • RADV_PERFTEST=nggc: enable NGGC. Can slightly improve performance on RX6000 series, but may reduce performance for other cards.
  • You may find more here: https://docs.mesa3d.org/envvars.html

Differences between Desktop Environments, and X11/Wayland

This page needs work, for the following reason(s): Might be outdated, and there is missing data for various desktop environments and window managers. I'm not sure if disabling composition is possible in Cinnamon (the DE of Mint). If it is not possible, this would make Cinnamon one of the worst choices.

• It appears that KDE Plasma (X11) with no composition (currently) is (one of) the best regarding performance, and input lag. Gnome is also ok.
  • Generally you should be fine if you can disable composition. This is not possible in Gnome, but Gnome uses unredirection (the same thing, Windows does) instead, which is almost as good.
• You should only use Wayland if you can enable FreeSync, because otherwise it will force vsync. If you are using KDE and you have FreeSync enabled, the performance and input lag should be close to KDE X11 with composition disabled. The input lag will increase by the "half frame" that is displayed with tearing. It's basically the question whether or not you want to wait for the frame to complete before displaying it. KDE Plasma is currently the best DE for Wayland.

It should be noted that we are talking about milliseconds here (the best value is 20ms, the worst is 90ms). If you are not susceptible to this, you may not even notice. But generally speaking, the game will feel more responsive if your input lag is low. You might also notice stuttering if your 99th percentile is bad.

Troubleshooting

• Limiting FPS with MangoHud can introduce input lag. (I assume it adds one frame delay. It might as well be a bug, and only happen in specific scenarios. If you know more, why this happens, if, or how it can be avoided, please add information here.)
• You might have a distribution that uses PulseAudio instead of Pipewire. Pulseaudio introduces heavy audio delay. You should switch to Pipewire.