Prism Launcher Modpacks & Mod Downloader
Download and update modpacks from Modrinth, CurseForge, FTB, Technic, and ATLauncher directly inside Prism Launcher on Windows.
Fabulously Optimized on Prism Launcher
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Flagship Fabric performance and OptiFine-parity modpack offering massive FPS gains, shaders, connected textures, and controller support. Runs on Fabric (1.16.5 – 1.21.4) with 2 GB – 4 GB RAM and Java 21 (for 1.20.5+).
- Modpack
- Fabulously Optimized
- Source Platform
- Modrinth & CurseForge
- Mod Loader
- Fabric (1.16.5 – 1.21.4)
- Recommended RAM
- 2 GB – 4 GB
- Java Requirement
- Java 21 (for 1.20.5+)
How to install Fabulously Optimized in Prism Launcher
Flagship Fabric performance and OptiFine-parity modpack offering massive FPS gains, shaders, connected textures, and controller support.
Click **Add Instance** on the Prism Launcher toolbar, choose **Modrinth** on the left sidebar, search for **Fabulously Optimized**, and click **OK**. Prism downloads the manifest and all mod JARs into an isolated instance folder.
Recommended Java and memory settings on Windows
- **Java runtime:** Java 21 (for 1.20.5+). Configure this under Java Settings so the pack does not fail the startup compatibility check.
- **Memory allocation:** Set Maximum Memory (`-Xmx`) to **2 GB – 4 GB** under Edit Instance → Settings → Memory.
- **Need the app?** Grab the Windows installer or portable build from /download.
Frequently asked questions
What if CurseForge blocks a few mods while installing Fabulously Optimized?
Prism Launcher opens the download pages for any blocked mods and watches your Windows `Downloads` folder automatically — click Download in your browser and Prism moves the files into place.
How much RAM does Fabulously Optimized need?
Allocate 2 GB – 4 GB under Edit Instance → Settings → Memory, and ensure you are running 64-bit Java 21 (for 1.20.5+).
Get Prism Launcher
Windows, macOS & Linux
Free and open source. Sign in with the Microsoft account that owns Minecraft, then create your first instance.
