SwappingAffinity
by MeiVinEight
SwappingAffinity is a Forge optimization mod for 1.20.1 that is installed on the client alone and changes nothing on the server.
What it does
The mod targets a problem with accessory swapping that the author describes as a crash path: a StackOverflowError that the mod catches and handles. Its notes also credit it with fixing a few bugs in the SmoothSwapping accessory mod, so the two are closely related in function. Only the client needs it, since servers run without it.
Files are published for Forge alone, for Minecraft 1.20.1, with version 1.0.0 as the latest build from 2026-01-10. The code is open source under the MIT License, and the source code and issue tracker are public.
Key features
Stack overflow handling
Catches a StackOverflowError that can occur during accessory swapping, so the error does not bring down the game.
SmoothSwapping fixes
Carries fixes for a few bugs found in the SmoothSwapping accessory mod, according to the author.
Client-only install
Players add it to their client only, and servers do not need to run it.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Questions
Does SwappingAffinity need to be installed on the server?
In the catalog
SwappingAffinity is one of 3,545 Optimization mods on ModsFinder, and one of 1,441 Optimization mods for Forge. 34,764 mods support Minecraft 1.20.1.
Similar mods
What the author says
This is an "Accessory" mod for SmoothSwapping, fixed some bugs: - crush cased by StackOverflowError.
Official listing
- Modrinth page
- modrinth.com/mod/swappingaffinity
- Owner
- MeiVinEight
- Published
- 2026-01-10
- Updated on Modrinth
- 2026-01-10
- Facts verified
- 2026-10-15