Vyvern Autopilot
by Vyvern
Vyvern Autopilot is a NeoForge optimization mod that removes surplus dropped items, XP orbs and projectiles from chunks that stay over capacity during prolonged lag.
What it does
The autopilot tracks the sustained tick-time pressure and entity-dense chunk readings that Vyvern Stats reports. When a chunk is truly over capacity under that pressure, it applies a conservative, reversible counter-measure by clearing its excess dropped items, XP orbs and projectiles. Chunks that are healthy are left alone, so a server that is not under pressure is not touched.
The mod ships with a master switch that defaults to off, and dry-run mode that defaults to on. Dry-run reports what would be removed without deleting anything, and the planned actions are published in the Vyvern panel. Nothing happens silently. Vyvern Bridge is required, and the mod is for NeoForge 1.21.1 only. It runs server-side, and the client is inert, so players need nothing installed. The license is custom and the code is not open source.
Key features
Conservative autopilot
Clears only excess dropped items, XP orbs and projectiles in chunks that are over capacity under sustained lag pressure.
Dry-run by default
Dry-run mode is on by default, so server owners can check every planned action in the Vyvern panel before enabling live cleanup.
Master switch off by default
The autopilot stays inactive until a server owner turns the master switch on, and every action is reported rather than applied silently.
Reversible actions
Counter-measures are reversible and are applied only to chunks that genuinely exceed capacity.
Compatibility
Latest build for each game version and loader.
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
Who it’s for: Server owners running NeoForge 1.21.1 who already use Vyvern Bridge and want automatic relief for entity-dense chunks under sustained lag.
How it compares
LagSweeper Datapack is a server-side datapack for Fabric, Forge, NeoForge and Quilt that targets 1.21.5, with a server-required, client-optional environment and all rights reserved. No Performance Only Lag is a NeoForge mod for 1.21.1 that runs on both client and server, also all rights reserved. Clumps is open source under the GNU Affero General Public License v3.0 or later, and covers 1.21 – 26.3 on four loaders.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Vyvern Autopilot | NeoForge | 1.21.1 | Server-side only | 2026-07-03 |
| LagSweeper Datapack | Fabric, Forge, NeoForge and Quilt | 1.21.5 | Server required, client optional | 2026-01-29 |
| No Performance Only Lag | NeoForge | 1.21.1 | Client and server | 2025-01-11 |
| Clumps | Fabric, Forge, NeoForge and Quilt | 1.21 – 26.3 | Server required, client optional | 2025-09-30 |
Questions
Does Vyvern Autopilot need Vyvern Bridge?
Does the client need Vyvern Autopilot installed?
Is cleanup active when the mod is first installed?
In the catalog
Vyvern Autopilot is one of 3,545 Optimization mods on ModsFinder, and one of 1,250 Optimization mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
More from Vyvern
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What the author says
Summary: A conservative, reversible performance autopilot — culls excess dropped items, XP orbs and projectiles under sustained lag pressure. Off and dry-run by default. Autopilot watches the same sustained-MSPT-pressure and entity-dense-chunk signals Vyvern Stats reports, and takes conservative, reversible…
Official listing
- Modrinth page
- modrinth.com/mod/vyvern-autopilot
- Owner
- Vyvern
- Published
- 2026-07-03
- Updated on Modrinth
- 2026-07-03
- Facts verified
- 2026-10-15