Chunk Border Redstone Highlighter
by Scainest
Chunk Border Redstone Highlighter marks redstone components that sit close to chunk borders, a common source of server lag, with a red wireframe box on the client.
What it does
Minecraft divides the world into 16 by 16 chunks, and each chunk is loaded, saved and ticked on its own. A redstone circuit that crosses a chunk boundary, where a signal passes from one chunk into the next, can force extra load and save cycles when observers, pistons or hoppers trigger across the edge. The mod scans a 32-block radius around the player and draws a red wireframe box around every risky block it finds, so the problem can be spotted before it affects tick rate.
The highlighter is a client-side debugging tool that changes nothing on the server. Detection uses the local coordinates from 0 to 15 on each axis, and the boundary math also works for negative coordinates. Server software using asynchronous chunk systems, such as Paper, Purpur and Folia, is described as suffering most from synchronization locks held across boundaries. The highlight can be toggled with a single key, O by default, which is rebindable under Options and Controls.
The mod is published for Fabric only, in version 1.0.0 for 1.21.11, released under the MIT License. It is not open source.
Key features
Risky block highlight
Redstone components near a chunk border are outlined with a red wireframe box, so they stand out in the world.
Radius scan
The scan covers a 32-block radius around the player and updates as the player moves through the world.
One-key toggle
Pressing O switches the highlight on or off, and the key can be changed in the Controls options.
Boundary detection
Blocks are checked against local coordinates 0 and 15 on both horizontal axes, which marks the edges of each chunk.
Gallery
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: The mod suits redstone builders and technical players who want to check circuits for chunk-boundary problems, and server owners who examine lag on Paper, Purpur or Folia servers.
How it compares
Protect My Redstone is a Fabric mod for 1.21.11 under the MIT License, and it runs on client and server, so both sides need it. Sculk Vision is client-side only, released under a Creative Commons Attribution Non Commercial 4.0 license, and covers 1.21 – 1.21.11. Chunk Border Redstone Highlighter works on the client alone and needs nothing on the server.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Chunk Border Redstone Highlighter | Fabric | 1.21.11 | Client-side only | 2026-04-14 |
| Protect My Redstone | Fabric | 1.21.11 | Client and server | 2026-03-09 |
| Sculk Vision | Fabric | 1.21 – 1.21.11 | Client-side only | 2026-04-28 |
Questions
Does Chunk Border Redstone Highlighter need to be installed on the server?
Which loader does Chunk Border Redstone Highlighter use?
Can the highlight key be changed?
In the catalog
Chunk Border Redstone Highlighter is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from Scainest
Similar mods
What the author says
One of the biggest causes of lag on high-performance servers: redstone circuits placed across chunk borders. This client-side mod highlights those risky blocks around you with a red wireframe box, letting you spot chunk-boundary issues before they hurt your TPS.
Official listing
- Modrinth page
- modrinth.com/mod/chunk-border-redstone-highlighter
- Owner
- Scainest
- Published
- 2026-04-14
- Updated on Modrinth
- 2026-04-14
- Facts verified
- 2026-10-15