CurseForge · Minecraft mod
Put A Plug In it! (PAPI)
A small mod that fixes Memory Leak issues, optimizes Memory Usage, and increases version/loader support for features of other Memory Leak Fix/Memory Optimization mods
This page is having a moment, so a few details may be a little behind.
Quick answer
Which Put A Plug In it! (PAPI) release should I use?
Put A Plug In it! (PAPI) papi-1.21.1-neoforge-1.1.3.jar targets 1.21, 1.21.1 with NeoForge. The project page does not say whether it belongs on the client. The project page does not say whether it belongs on the dedicated server. No extra mods listed for this file.
Where it goes
Is Put A Plug In it! (PAPI) required on the client, server, or both?
The project page does not say whether it belongs on the client. The project page does not say whether it belongs on the dedicated server.
The source does not explicitly classify this release as client-only or server-only.
What else does Put A Plug In it! (PAPI) papi-1.21.1-neoforge-1.1.3.jar need?
papi-1.21.1-neoforge-1.1.3.jar. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Put A Plug In it! (PAPI) without breaking your instance.
Built for Put A Plug In it! (PAPI) papi-1.21.1-neoforge-1.1.3.jar. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use papi-1.21.1-neoforge-1.1.3.jar. It targets 1.21, 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
The project page does not say whether it belongs on the client. The project page does not say whether it belongs on the dedicated server.
- 04
Pick the file you checked
Use the “Get this file” button beside papi-1.21.1-neoforge-1.1.3.jar. It opens that exact file at the source.
About this project
What does Put A Plug In it! (PAPI) add?
Put A Plug In it! (PAPI) initially solved a Memory Leak I found with Sophisitacted Core while playing the "NightfallCraft - The Casket of Reveries" Modpack by P1nero
Sophisticated Core natively fixed the Memory Leak in their 1.20.1+ Forge & NeoForge versions, but the pre-1.20.1 and Fabric versions of the mod still have the glitch, which PAPI can be used to fix.
PAPI now also aims to find and solve as many Memory Leaks as possible, and integrate features and compatability for and from other mods, to make an all-in-one Memory Leak Fix and Memory Optimization mod, and to increase version and loader support for features of other Memory Leak Fix and Memory Optimization Mods.

Icon and Name by lyftos, inspired by Plug & Play by Morio von Rickenbach, and Michael Frei (Playables)
Core Features
- Sophisticated Core ItemStackKey leak mitigation
- Prevent known crashes between RaphiMC's ImmediatelyFast and FX (FX_PR0CESS)'s Memory Leak Fix (MemoryLeakFix)
- Prevent Screen-Freeze Glitch caused by RaphiMC's ImmediatelyFast on Intel IGP's and GPU's
Features Derrived or Adapted From Other Mods
FX (FX_PR0CESS)'s Memory Leak Fix (MemoryLeakFix)
- Biome Temperature cache sharing
- Entity brain-memory cleanup trio
- TagKey weak intern pool
- Drowned navigation cleanup
- Crosshair target / hit result reset
- Huge screenshot buffer free-on-failure
I intend to add more Memory Leak fixes in the future so if you know of any mods or modpacks that you suspect of having Memory Leak issues, let me know in the comments!
Project description from CurseForge.
Pick your setup
Put A Plug In it! (PAPI) by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.11
1 loader build1.21.10
1 loader build1.21.8
1 loader build1.21.5
1 loader build1.21.4
1 loader build1.21.1
2 loader builds1.21
1 loader build1.20.6
1 loader build1.20.5
1 loader build1.20.4
3 loader builds1.20.3
1 loader build1.20.2
1 loader buildShowing the newest 12 of 18 game versions. Older files are in the list below.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Put A Plug In it! (PAPI) versions and loaders
papi-1.21.1-neoforge-1.1.3.jar
8 May 2026
papi-1.21.1-neoforge-1.1.2.jar
7 May 2026
papi-1.21.1-neoforge-1.1.1.jar
4 Apr 2026
papi-1.20.1-fabric-1.1.1.jar
8 Mar 2026
papi-1.20.1-forge-1.1.1.jar
8 Mar 2026
papi-1.20.1-forge-1.1.0.jar
7 Mar 2026
papi-1.20.4-neoforge-1.0.1.jar
24 Feb 2026
papi-1.21.11-neoforge-1.0.1.jar
24 Feb 2026
papi-1.21.10-neoforge-1.0.1.jar
24 Feb 2026
papi-1.21.8-neoforge-1.0.1.jar
24 Feb 2026
papi-1.21.5-neoforge-1.0.1.jar
24 Feb 2026
papi-1.21.4-neoforge-1.0.1.jar
24 Feb 2026
Looking for an older file? The official CurseForge project page is in Resources.