Name- Walksy-crystal-optimizer-mod-fabric-...: File

It's difficult to give a specific "solid report" without the exact full filename (e.g., Walksy-Crystal-Optimizer-Mod-Fabric-1.20.1-2.1.0.jar ). However, based on the naming pattern, this is almost certainly a for Fabric (not Forge) that optimizes crystal PvP or crystal rendering/mechanics.