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Modulo

by fabianbuthere

Players building large structures on a server can stop lag spikes from their work by using Modulo, which changes how block changes are handled in far-off chunks.

ForgeServer-side onlyGNU Affero General Public License v3.0 or laterOpen source1.20 – 1.20.1

What it does

Modulo is a Forge mod for server owners. Its feature set centers on how block placement and breaking are processed across chunks, with the goal of keeping the simulation distance low without freezing the game when players build or destroy large areas. Everything a build or destroy action touches gets copied into the mod's own chunk handling, so changes do not stall the main loop while distant chunks are still loading.

The author describes the mod as made for lower-end systems that keep simulation distance low. Per the author, it runs acceptably with higher values, especially on older CPUs, where placing or breaking blocks would otherwise freeze the game for a few hundred milliseconds once the simulation distance goes above 16 chunks. The mod is server-side only, which means it applies to singleplayer worlds and dedicated servers alike, and it is not needed on the client.

Modulo is licensed under the GNU Affero General Public License v3.0 or later and is open source, with public source code and an issue tracker. Files are published for Forge 1.20 and 1.20.1, and the latest file, 1.0.0-1.20.1, dates from 2026-05-08.

Key features

  1. Copied chunk handling

    Block changes in every affected chunk are copied into the mod's handling, so building and destroying stay responsive.

  2. Lower simulation distance

    Modulo is aimed at servers that keep simulation distance low, where large edits would otherwise cause stutter.

  3. Freeze reduction above 16 chunks

    The author reports that placing and breaking blocks freezes the game briefly once simulation distance is above 16 chunks, which the mod targets.

  4. Server-side operation

    The mod runs on the server only, so it works in singleplayer worlds and on dedicated servers.

Compatibility

Latest build for each game version and loader.

1.20.11.0.0-1.20.1
1.201.0.0-1.20.1
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Use cases

Who it’s for: Server owners and hosts running Forge 1.20 or 1.20.1 who see freezes when players build or destroy blocks in large areas. Singleplayer players on Forge can install it as well, since it runs in singleplayer worlds too.

Questions

Does every player need Modulo installed?

No. Only the server needs it, and players join without installing anything. Players join without installing anything.

Which Minecraft versions does Modulo support?

Files are published for 1.20 and 1.20.1, and the latest file, 1.0.0-1.20.1, is built for 1.20.1. No Forge file targets other versions.

Can Modulo run in singleplayer?

Yes. Because it is server-side only, it works in singleplayer worlds as well as on dedicated servers.

More from fabianbuthere

All projects
Brewery Reimagined1.20.1RPN - Gameplay1.20 – 1.20.6Shuttered1.21.1All Credits1.20.1

What the author says

This mod is inspired by the many videos I saw about this kind of mod, but didn't link the mod in their description - so I made it myself. Warning: Especially on lower-end systems, keep your simulation distance low. It runs okay with higher values, but especially if you have an older CPU, placing / breaking a block…
fabianbuthere, on the Modrinth page

Official listing

Owner
fabianbuthere
Published
2026-05-08
Updated on Modrinth
2026-05-08
Facts verified
2026-10-15
Open on ModrinthCompare