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lutris: added performance tweaks

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@ -11,7 +11,7 @@ Additionally to that Lutris supports many different
## Usage
### Manually add a game
### Manually Add a Game
By clicking on the `+` in the left upper corner of the Lutris application a new
game can be manually added.
@ -33,7 +33,70 @@ afterwards.
After selecting `Install a Windows DLL or component` the package to install can
be selected.
### DX12/DX13 is not supported on your system
### Setting Environment Variables
Environment variables can be set globally or on a per game basis.
To set them globally navigate to the `Global options` tab in the `Preferences`.
There the `Environment variables` can be added and removed by selecting the
corresponding buttons.
To set the environment variables for a single game right-click the game and
select `Configure`.
Navigate to the `System options` tab where the `Environment variables` can be
found.
An environment variable has two parts.
The key and the value.
This guide uses the notation `key=value` for better readability.
The following is an example of an environment variable in this notation.
```txt
__GL_SHADER_DISK_CACHE=1
```
### Nvidia Shader Cache Settings
This section is based on a
[piece of documentation by Lutris](https://github.com/lutris/docs/blob/master/Performance-Tweaks.md#nvidia-gpu-only-optimization)
regarding performance optimization for systems with [Nvidia](/wiki/nvidia.md)
GPUs.
For Nvidia GPUs the shader cache is set to have a softlimit of 128MB.
This can be easily reached by some games and will cause performance limitations.
The cleanup of the cache after reaching 128MB can be disabled.
For this set `__GL_SHADER_DISK_CACHE_SKIP_CLEANUP` as explained in the
[section regarding environment variables](#setting-environment-variables).
By default Lutris uses a cache location for all games.
For better trouble shooting capabilities a unique shader location for each game
can be set.
This can be done with the [environment variable](#setting-environment-variables)
`__GL_SHADER_DISK_CACHE_PATH=</path/to/shaders/>` that has to be set as a per
game variable and adapted with a path of your choosing.
### Performance Tweaks
This section addresses ways of increasing the performance of games when run by
Lutris.
An easy way to increase the performance of games is to install and enable
[Feral GameMode](https://github.com/FeralInteractive/gamemode) as recommended in
the [documentation of Lutris](https://github.com/lutris/docs/blob/master/Performance-Tweaks.md#enable-game-mode).
It is important to install both the 64-bit and the 32-bit version to ensure full
functionality.
Check the package manager of your distribution for packages with the names
`gamemode` and `lib32-gamemode` or similar names or install it manually via git.
Afterwards check in Lutris `Preferences` if `Enable Feral GameMode` is checked
under the `Global options` tab.
Another way to increase the performance is to increase the
[Nvidia Shader Cache](#nvidia-shader-cache-settings) limit.
## Troubleshooting
This section explains ways of solving various problems that can occur when using
Lutris.
### DX12/DX13 is not Supported on Your System
This section handles a fix if the game is not able to run due to the system not
supporting DX12 or DX13.