> For the complete documentation index, see [llms.txt](https://chertia.gitbook.io/chertia-wiki/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://chertia.gitbook.io/chertia-wiki/the-chertia-wastes/modpack-information/performance-and-fixes.md).

# Performance & Fixes

### Performance Improvements / Fixes

#### RECOMMENDED: Increasing Allocated RAM & Adjusting Garbage Collector

If you have RAM to spare, it is recommended that you increase the allocation from 6 GB to at least 8  GB. Additionally, Distant Horizons recommends using ZGC as Minecraft's garbage collector, which is easy to do.

| Step                                                                                                                             | Screenshot                                                          |
| -------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------- |
| Allow the modpack to download. When finished, open the instance and select "Instance settings" at the top right.                 | <img src="/files/3GWrXebi37HixOP2QrdX" alt="" data-size="original"> |
| Under "Java and memory", check "Custom meory allocation" and adjust the slider. Changing it to 8 GB, or 8192 MB, is recommended. | <img src="/files/foQJiY2mN3YJ2afDmg5p" alt="" data-size="original"> |
| Check "Custom Java arguments" and enter `-XX:+UseZGC`.                                                                           | <img src="/files/M84Dpn3bv9CVyG7GXxtt" alt="" data-size="original"> |
| Here is what the finished screen should look like. You can now launch the game.                                                  | <img src="/files/h3nlzQthuTn3pgxmkOA5" alt="" data-size="original"> |

***

{% hint style="danger" %}
**NOTE:** I recommend not following the steps below unless necessary.
{% endhint %}

#### Fixing Crashes Related to Vulkan / Using Shaders

If you wish to use shaders or you are having crashes due to the modpack's preference of Vulkan over OpenGL, you can follow these steps.

**Using Shaders is not recommended as the Minecraft rendering engine is in a weird place, and compatibility issues are frequent.** It's worth noting that I personally receive a 20%-50% increase in FPS by using Vulkan (the modpack's default setting).&#x20;

<table data-search="false"><thead><tr><th>Step</th><th>Screenshot</th></tr></thead><tbody><tr><td>On the instance screen, select "Open folder". Ensure the game is closed.</td><td><img src="/files/aovkoVgr3oRXGvzTzqGv" alt="" data-size="original"></td></tr><tr><td>Find "options.txt" and open it. Find "preferredGraphicsBackend" and change the value from "vulkan" to "opengl".</td><td><img src="/files/lfSvH5stw2eox7Xd70Rn" alt="" data-size="original"></td></tr><tr><td>Save the file. </td><td><img src="/files/0ibv957uBTF4b9YBiYMh" alt="" data-size="original"></td></tr><tr><td>Back in the folder, navigate to the "config" folder and find "DistantHorizons.toml". Open the file with any text editor.</td><td><img src="/files/uugvMinwf70O6G1awOMt" alt="" data-size="original"></td></tr><tr><td>Using control+f or command+f, find "renderingEngine" and change the value from "BLAZE_3D" to "OPEN_GL".</td><td><img src="/files/RuP3xMbUFOkkqZufKz5g" alt="" data-size="original"></td></tr><tr><td>Save the file.</td><td><img src="/files/OZJgIlnvokhBzDIDK5KA" alt="" data-size="original"></td></tr><tr><td>If you want to use shaders, return to the instance screen, find "Iris Shaders", and enable the mod.</td><td><img src="/files/Th7YTTNd4KBzPgavKX07" alt="" data-size="original"></td></tr></tbody></table>