RLCraft & RLCraft Dregora on Prism Launcher
Notoriously challenging survival overhaul on Minecraft 1.12.2 requiring 64-bit Java 8 and tuned heap allocation. Runs on Forge (1.12.2) with 6 GB – 8 GB RAM and Java 8 (64-bit Temurin 1.8.0).
RLCraft & RLCraft Dregora: FPS & Crash Fix Guide
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Memory tuning (6 GB – 8 GB), Java 8 (64-bit Temurin 1.8.0) setup, and crash troubleshooting for RLCraft & RLCraft Dregora in Prism Launcher.
- Target Modpack
- RLCraft & RLCraft Dregora
- Required Java
- Java 8 (64-bit Temurin 1.8.0)
- Optimal Heap RAM
- 6 GB – 8 GB
- Loader
- Forge (1.12.2)
Eliminating lag spikes and stutters in RLCraft & RLCraft Dregora
When running RLCraft & RLCraft Dregora on Windows, stutter usually comes from either too little heap memory or an over-allocated heap (>12 GB) causing long JVM garbage-collection pauses.
Lock your instance memory inside the **6 GB – 8 GB** sweet spot and verify that `javaw.exe` is assigned to your dedicated NVIDIA or AMD GPU in Windows Graphics Settings.
Fixing startup crashes and updating safely
- Confirm your instance uses **Java 8 (64-bit Temurin 1.8.0)** under Edit Instance → Settings → Java.
- Before updating the modpack to a new release, right-click the tile and select Copy Instance so your existing world and configs have a rollback point.
- If a crash persists, click **Upload** in the Minecraft Log tab to generate an mclo.gs diagnostic link. Get the latest Prism build at /download.
Frequently asked questions
Why does RLCraft & RLCraft Dregora crash before reaching the title screen?
90% of pre-title-screen crashes on RLCraft & RLCraft Dregora happen because Prism is pointing at the wrong Java major version instead of Java 8 (64-bit Temurin 1.8.0).
Can I add extra performance mods or shaders to this pack?
Yes. Open Edit Instance → Mods → Download mods to add FerriteCore, ModernFix, or Iris/Oculus matching your loader.
Get Prism Launcher
Windows, macOS & Linux
Free and open source. Sign in with the Microsoft account that owns Minecraft, then create your first instance.
