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This is the most critical question. Because the file is a .jar , Windows may flag it as "Unrecognized." Here is how to verify safety:
Download the "Fabric API" mod, as most mods (including Francium) require it to function. File name- Francium-Client-Mod-Fabric-1.19.4.jar
Because it avoids changing fundamental world generation, it is safer to add to existing worlds than many experimental performance mods. Review: Ghost Client Features (The Hacked Client) This is the most critical question
It is built for the Fabric Loader on version 1.19.4 . It is widely compatible with other popular optimization mods like Lithium or FerriteCore. Review: Ghost Client Features (The Hacked Client) It
While Francium is a standalone JAR, it is often bundled with custom builds of Sodium (the rendering engine) and Iris (shaders). The 1.19.4 version specifically optimizes memory garbage collection, reducing "stuttering" when exploring new chunks.