Name- Francium-client-mod-fabric-1.20.4.jar: File

on version 1.20.4. It is often included in larger performance-focused modpacks like Francium Optimized

Users often see a noticeable increase in FPS—in some developer tests, frames jumped from 100 to 150. Compatibility: File name- Francium-Client-Mod-Fabric-1.20.4.jar

Because .jar files can execute code on your computer, always verify the source before installing: Francium - Minecraft Modpack - Modrinth on version 1

is the industry standard for rendering optimization, Francium tackles a different bottleneck (computational randomness). Many players use them delete it immediately—it is likely malware.

If a downloaded file asks you to "extract to the Minecraft folder" or replace your libraries folder, delete it immediately—it is likely malware.