Sword Optimizer
Sword Optimizer changes how sword swings are processed on the client, so attacks register without waiting for a server reply.
What it does
Sword swings are handled instantly on the client rather than waiting for the server to confirm each one. The mod targets the delay between clicking and seeing the attack, aiming to keep the vanilla combat feel while reducing that lag, especially when latency is high. Because the work happens client side, only the player who installs it is affected.
The mod is client-side only, so servers run without it and players join multiplayer games without installing anything extra. It is published for Fabric alone, with files for the range above, and requires Java 21 or newer. Its author notes that a Forge version is planned but not yet available.
Sword Optimizer is released under the MIT License, but it is not open source. Its latest file, v0.5.0-beta for 1.21.11, was published on 2026-05-24, the same day as the first release.
Key features
Instant swing processing
Sword swings are processed on the client at once instead of waiting for a server response.
Reduced click-to-attack delay
The gap between clicking and seeing the attack is reduced, which matters most on connections with high latency.
Vanilla combat feel kept
Combat keeps the timing and feel of vanilla sword use while the response becomes more immediate.
Lightweight design
The mod is described as small and optimized, with a narrow scope limited to sword combat.
Multiplayer compatible
The change runs in the player's client, so it works on multiplayer servers without any server-side install.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players who use swords in multiplayer and want quicker feedback on their clicks. Server owners do not need to install anything.
How it compares
Potion Optimizer is a Fabric mod for 1.21.11 under the MIT License, client-side only and not open source. PVP Optimizer is a Fabric mod for 1.21.1 – 1.21.11 that needs the client, with the server optional, so it covers a wider range of versions and a different environment than Sword Optimizer. Sword Optimizer itself is client-side only and targets the range above.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Sword Optimizer | Fabric | 1.21.9 – 1.21.11 | Client-side only | 2026-05-24 |
| Potion Optimizer | Fabric | 1.21.11 | Client-side only | 2026-07-18 |
| PVP Optimizer | Fabric | 1.21.1 – 1.21.11 | Client required, server optional | 2026-05-20 |
Questions
Does Sword Optimizer need to be installed on the server?
Which loader does Sword Optimizer support?
Which game versions are covered?
In the catalog
Sword Optimizer is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
Sword Optimizer is a lightweight Minecraft mod that makes sword combat feel smoother and more responsive by processing sword swings instantly on the client side instead of waiting for the server response. The mod keeps the vanilla combat feel while reducing the delay between clicking and seeing your attack.
Official listing
- Modrinth page
- modrinth.com/mod/swordoptimizer
- Owner
- thedutchpianoman_
- Published
- 2026-05-24
- Updated on Modrinth
- 2026-05-24
- Facts verified
- 2026-10-15