Setting up Minecraft

This section goes over how to best set up Minecraft itself for speedrunning.

Launcher

• Here, we will be installing a fork of MultiMC called Prism Launcher.
• On Fedora, install Prism by opening a terminal and running these commands:

sudo dnf copr enable g3tchoo/prismlauncher
sudo dnf install prismlauncher

• This should install Prism Launcher - open the start menu and search for it.
• Users on other distros should locate their distro on the Prism download page and follow the instructions.
  • Avoid using Flatpak (Flathub) where possible - you may run into issues running waywall later.

Instance Setup

• You can watch this Windows setup guide to get your Minecraft instance set up. The instructions should be largely the same on Linux, with the exception of:
  • Running Java apps (i.e. ModCheck), as explained in the Java section earlier, can be done in the terminal with java -jar <path/to/jarfile.jar>, replacing <path/to/jarfile.jar> with the actual path to the .jar file.
  • Ninjabrain Bot will not work out of the box on Wayland - we will setup an app called waywall later to address this.
  • Jingle is a Windows-only application - we will set up alternatives later for either Wayland or X11.

Further optimizations

• The default version of GLFW included in LWJGL for Minecraft version 1.16.1 may cause crashes when tabbing out of the game, and tends to have worse performance.

  • Update LWJGL by right clicking your instance in Prism > Edit > Version > Right click LWJGL 3 > Change Version > Select 3.3.3 (newer versions have their own share of issues).

• Using jemalloc may greatly improve memory performance for Minecraft on Linux.

  • To install jemalloc on Fedora, open up a terminal and run sudo dnf install jemalloc-devel.
  • To find where jemalloc installed to, run jemalloc-config --libdir. This is usually /usr/lib, which means the full path to jemalloc would be /usr/lib/libjemalloc.so.
  • To ensure Minecraft runs with jemalloc, go to Prism > Settings > Environment Variables. Add a new environment variable with the name LD_PRELOAD. Under "Value", enter the path to jemalloc we found earlier.

• NVIDIA users should add another environment variable named __GL_THREADED_OPTIMIZATIONS and set its value to 0. With driver versions greater than 525, not having this variable set may cause crashes, or make preemptive navigation very inconsistent because of a driver-side optimization to the Minecraft renderer (colloquially known as "preemptive bug").

• Your environment variables should look something like this:

  

• Finally, users on dual-GPU setups (i.e. laptops with integrated and dedicated graphics) should ensure Minecraft runs with dedicated graphics.

  • In Prism, go to Settings > Minecraft > Tweaks > Check Use discrete GPU.

Moving forward

Move to the next section to continue setup.