Dimension Leak Fix
by Bahanos
Dimension Leak Fix is a Fabric client mod that clears memory retained by the previous world after the player changes dimension.
What it does
When the client creates a new world on a dimension change, several mods can keep references to the old one, and its data stays in memory. The mod detects dimension transitions automatically and breaks those retention chains, which the author reports recovers roughly 2 to 4 GB per transition. Cleanup runs in two phases: the first detaches world references, entity sets, cached block entities and renderer caches, and a second phase about three seconds later releases chunk storage and remaining slots so the renderer is not disturbed mid-transition.
The mod only applies fixes that match the mods actually installed, so it changes nothing when none of the affected mods are present. It is client-side only, so servers and other players do not need it. Files exist for Fabric alone, with the latest build 1.0.2+26.2 for 26.2, released on 2026-08-21. The code is all rights reserved and the mod is not open source.
Key features
Automatic transition cleanup
Dimension changes between the Overworld, Nether and End are detected without any player action, and the old world is released.
Two-phase release
Cleanup is split into a first pass on world references and entity sets, and a delayed second pass on chunk storage to avoid renderer interference.
Conditional fixes
Only the fixes relevant to installed mods are applied, so the mod leaves unrelated setups untouched.
Logged operations
Each transition writes a log of what was detached, cleared and released, which helps when checking whether the cleanup ran.
Compatibility
Latest build for each game version and loader.
26.x4 of 4 versions with builds
1.21.x12 of 12 versions with builds
1.20.x7 of 7 versions with builds
1.19.x5 of 5 versions with builds
1.18.x1 of 1 version with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Frequent travel between dimensions
Players who move often between the Overworld, Nether and End are the ones who see old worlds accumulate in memory.
Who it’s for: Players running Fabric clients with sound, render or map mods that the author tested, such as Iris, Sodium, Distant Horizons, Create and Collective AmbientSounds.
Questions
Does Dimension Leak Fix need Fabric API?
Does the server need Dimension Leak Fix?
Which game versions have files?
Does the mod change behavior when no related mods are installed?
In the catalog
Dimension Leak Fix is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 13,894 mods support Minecraft 26.2.
More from Bahanos
Similar mods
What the author says
Every time you travel between the Overworld, Nether, and End, your client creates a new ClientWorld. The old world should be garbage-collected, but several popular mods accidentally hold references to it - causing it to stay in memory forever. After just a few dimension changes, this can eat 4-8 GB of RAM, leading to…
Official listing
- Modrinth page
- modrinth.com/mod/dimension-leak-fix
- Owner
- Bahanos
- Published
- 2026-03-01
- Updated on Modrinth
- 2026-08-21
- Facts verified
- 2026-10-15