Visual hotbar feedback
Minecraft usually waits for its next client tick to update the selected hotbar slot on your screen. Herzium changes that visual timing. When you press a hotbar key, the mod displays the updated slot highlight on the very next rendered frame. On a monitor with a high refresh rate, you can see that feedback up to roughly 50 milliseconds faster.
Ordinary items also appear in your hand on that next frame. Herzium removes the decorative equip dip for standard items in both hands. Combat gear stays on the standard path. Swords, axes, pickaxes, maces, spears, tridents, bows, crossbows, and shields keep their complete equip transitions. The mod also smooths out the attack meter display within the current tick without touching cooldown lengths or combat timing.
Input preferences and limits
Herzium is purely visual by default. The preview runs on your client and doesn't send provisional data to the server. That real selected slot, block interactions, attack checks, reach, and network packets stay standard. Real talk, if the preview repeatedly disagrees with the game state, Herzium turns off previews for the rest of that session.
You can also pick alternative slot selection orders through Mod Menu when multiple keys trigger in the same tick. The default Vanilla mode picks the highest numbered slot. Herzium mode picks the most recently pressed binding. Vanilla reversed selects the lowest slot. These preferences change the actual selected item rather than just the visual overlay, which alters the outgoing packet. Servers may regulate non-standard selection orders, so check local server rules before using them.
Herzium doesn't boost frame rates, speed up background ticks, or cut actual loading work. It strips out cosmetic fades on the title screen and the pause after world creation, but background tasks still run normally. Your mouse sensitivity, raw input, camera smoothing, and options file stay untouched.
Compatibility and requirements
You need Minecraft 26.1.2, Fabric Loader 0.19.3 or higher, and Java 25. The mod runs entirely on the client. Fabric API isn't required. Mod Menu is optional.
Herzium works alongside input mods like KoHsium, Raw Input Buffer, Ixeris, and KoHs Inventory Tweaks without interfering with cursor placement. If you install Exordium, Herzium bypasses Exordium HUD caching so frame previews can draw properly. You should avoid pairing them if you depend on that caching. The mod includes English alongside Spanish translations for Argentina, Chile, Ecuador, Mexico, Spain, Uruguay, and Venezuela. A brief information screen appears once on first launch and stays dismissed after you click continue.
