Kenny´s Hotbar Optimizer
by Kennyball42
Kenny´s Hotbar Optimizer changes how hotbar slot switches are processed on the client, so each key press takes effect without waiting for the next game tick.
What it does
In vanilla Minecraft, pressing a number key from 1 to 9 or scrolling the hotbar is handled only on the next tick, which can cost up to 50 ms of local responsiveness. A tick can apply just one pressed slot, so quick successive switches may disappear. This mod moves slot handling into per-frame processing, so a keypress switches the slot immediately and several switches within one tick are resolved correctly.
The change affects only local input and slot handling on the client. No packets are sent outside the normal server tick and the Minecraft protocol is left intact, so the server receives the same switch packets as before. The author positions it for fast PvP combos and for high-FPS setups where the hotbar feels noticeably smoother. It requires Fabric API and is published for Fabric only.
Key features
Instant slot switching
A number key or scroll input changes the selected slot during the current frame instead of waiting for the next tick.
Multiple switches per tick
Several slot changes that arrive within one tick are each applied, rather than all but one being dropped.
Per-frame processing
Slot handling runs every rendered frame, which makes the hotbar more responsive at high frame rates.
No server packet changes
Switch packets are sent in the normal server tick, so the mod changes only local input handling.
Compatibility
Latest build for each game version and loader.
26.x2 of 2 versions with builds
1.21.x8 of 8 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Fast combat
Players who rely on quick weapon and item swaps during PvP fights can switch slots without the one-per-tick delay.
High-FPS play
Players running high frame rates get a hotbar that responds on each frame rather than in step with the tick rate.
Who it’s for: Players who want snappier hotbar input in single-player or on multiplayer servers. Because only the client changes, server owners do not need to install anything.
Questions
Does Kenny´s Hotbar Optimizer need Fabric API?
Does the server need this mod?
Which game versions does it support?
In the catalog
Kenny´s Hotbar Optimizer is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 15,189 mods support Minecraft 26.1.2.
Similar mods
What the author says
Hotbar Optimizer Removes the delay when switching hotbar slots In vanilla Minecraft, your hotbar switch (number keys 1-9 or scrolling) is only processed on the next game tick costing up to 50 ms of local responsiveness. And only ONE pressed slot is committed per tick, so rapid multi switches get lost.
Official listing
- Modrinth page
- modrinth.com/mod/kennys-hotbar-optimizer
- Owner
- Kennyball42
- Published
- 2026-08-30
- Updated on Modrinth
- 2026-10-06
- Facts verified
- 2026-10-15