The Wither Storm is designed to grow, and a bigger boss plus lots of moving blocks costs performance. These adjustments keep the later stages playable on typical hardware.

Why it gets heavy

As the encounter escalates, the game has to render a very large entity, simulate blocks and creatures being pulled in and keep more of the world active. Both your graphics card and, especially, your CPU and memory feel the difference.

Memory allocation

Forge setups often benefit from more memory than vanilla's default. In the Minecraft Launcher, edit the Forge installation, open More options and change the -Xmx value in the JVM arguments.

  • -Xmx4G is a reasonable starting point for a light modded game.
  • Larger modpacks may want 6 to 8 GB if your computer has plenty to spare.
  • Don't hand Minecraft most of your system memory. Leave enough for the operating system, or performance can get worse.

Video settings

SettingSuggestion
Render distanceLower it first. 8 to 12 chunks is often a good balance during the fight.
GraphicsSwitch to Fast for the encounter.
Entity shadowsTurning them off can help.
ParticlesSet to Decreased or Minimal.
Max framerateCap it near your monitor's refresh rate to reduce heat and stutter.

If you add performance mods, confirm they support your exact Forge and Minecraft version and test them together before a big session.

The mod's config

After the first launch, Forge creates configuration files in your game's config folder, and servers also keep per-world settings in the world's serverconfig folder. Open the mod's file in a text editor to see what your version allows you to change. Options vary by release, so change one thing at a time and keep a copy of the original file.

On servers

  • Use /forge tps to check ticks per second during the encounter; 20 is full speed.
  • Keep view distance in server.properties modest for event days.
  • Restart the server before the event so it starts fresh.
  • Make a backup, because a laggy fight is still a destructive one.

Still crashing rather than just slowing down? Try the crash fixes guide.

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