Give Minecraft more memory: ATLauncher

Just the Dungeon Train instance (recommended)

1. Go to Instances.
2. On the Dungeon Train card, click Settings.
3. Open the Java/Minecraft tab.
4. Set Maximum Memory/Ram to 6144 MB (6 GB).
5. Click Save.

Every instance (global setting)

1. Open Settings.
2. Open the Java/Minecraft tab.
3. Set Maximum Memory/Ram to 6144 MB.
4. Click Save.

Then close the game and launch the instance again. The new memory only applies from the next launch.

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Other launchers: see Give Minecraft more memory.