Pack Doctor
by anonymoosey
Pack Doctor lets a modpack maker turn off slow or broken mod integrations through a config file, without editing mod jars.
What it does
Some mods ship integrations with other mods that cause slow starts or errors, and the usual fix is to delete whole mod classes from the jar. Pack Doctor replaces that step with plain config lines, so a pack maker can disable a single integration and leave the rest of the mod working. The JEI plugin of a mod can be switched off on its own, which matters when one plugin costs a long delay on the world-join screen. In one real pack, a single integration with an anvil recipe mod stretched world join by 42 seconds, because its cross-products forced the game to match every item against every spell.
The mod also covers the recipe book, which can stall survival inventories when a mod throws errors while categorising recipes. Creative inventories stay fine in that case, and the log points to the cause. Pack Doctor can disable the recipe book entirely, or drop one mod's recipes from it while keeping the rest working, and JEI is unaffected either way because recipes still show up there. Mods that force a guidebook into the player's hands on join can be handled through a config toggle, and Patchouli books that share an item but differ only by NBT can be blocked one at a time.
Key features
Config-driven disabling
Config lines turn off a mod's integration, plugin or recipes without editing or removing any jar file.
Per-plugin JEI toggle
Individual JEI plugins can be blacklisted while the others keep working. Entries can name a single plugin or cover every registration of a mod.
Automatic blacklist safety net
With autoBlacklistOverSeconds set above 0, a plugin that took longer than that limit on one launch is skipped on the next and logged. A value of 0 disables the check.
Removal logging
When a rule removes an item stack, the log records the rule that matched, which helps trace players reporting missing items.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Experience Jars is a Forge 1.20.1 mod for client and server together, published under All rights reserved and not open source, so it is a different kind of tool. CustomPanelGUI is client-side only for 1.20.1 – 1.20.6 and is also All rights reserved. Just Enough Recipe Integrations targets only 1.12.2 and is open source under the GNU Lesser General Public License v2.1 only, so it does not overlap with Pack Doctor on 1.20.1.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Pack Doctor | Forge | 1.20.1 | Client or server, optional | 2026-07-22 |
| [🧲MAGNETIC JARS] Experience Jars | Forge | 1.20.1 | Client and server | 2025-02-28 |
| CustomPanelGUI | Forge | 1.20.1 – 1.20.6 | Client-side only | 2026-04-28 |
| Just Enough Recipe Integrations | Forge | 1.12.2 | Client and server | 2023-11-17 |
Questions
Does Pack Doctor need to be installed on both sides?
Which loader does Pack Doctor support?
How does the automatic blacklist decide which plugin to skip?
In the catalog
Pack Doctor 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
Some mods ship integrations that are slow, broken, or simply not wanted, and give you no way to turn them off. Your options are normally to delete the whole mod or edit classes out of its jar. Pack Doctor turns those into config lines.
Official listing
- Modrinth page
- modrinth.com/mod/pack-doctor
- Owner
- anonymoosey
- Published
- 2026-07-22
- Updated on Modrinth
- 2026-07-22
- Facts verified
- 2026-10-15