Preparing Your Modpack
Overview
Cleanroom Loader is compatible with the vast majority of Forge mods and will usually run them without issue.
However, some mods remain deprecated, redundant, or outright incompatible—either because they’ve been superseded by better alternatives or because they introduce critical problems.
To prepare your modpack for Cleanroom Loader, review the lists below and make replacements where necessary.
Incompatible / Problematic Mods
| Mod | Reason | Action |
|---|---|---|
| AdvancedShader | Binary patching, incompatible. | 🚫 Remove |
| Essential.gg | Patched but causes many issues. | ✅ Use Lan UPNP (Non-Proxy option) or E4MC Retro (Proxy Option) |
| FoamFix | Outdated and prone to cause issues in Cleanroom Environment | ✅ Use VintageFix |
| Forgelin | Outdated and blacklisted | ✅ Use Forgelin-Continuous |
| Gnetum | Prone to cause issues | ✅ Use StellarCore |
| LibrarianLib | Will not work correctly with Forgelin-Continuous | ✅ Use LibrarianLib-Continuous (May break Wizardry Animations) |
| Mouse Tweaks | Outdated and prone to cause issues | ✅ Use Mouse Tweaks Unofficial |
| Phosphor | Incompatible | ✅ Use Alfheim Lighting Engine / Hesperus |
| Polyfrost series | Awaiting official fixes. | — |
| Raw Input | Already included in Cleanroom. | 🚫 Remove |
| Secret Rooms | Has an issue with updater | 🚫 Disable the update checker in config file |
| SerializationIsBad | Redundant. Modern Java versions fix the issue this solves | 🚫 Remove |
| TexFix | Merged and rewritten in CensoredASM | ✅ Use CensoredASM |
| VanillaFix | Merged and improved in CensoredASM | ✅ Use CensoredASM |
Note
If your modpack uses Bansoukou 4, make sure to run the instance at least once before installing cleanroom loader so its patches are applied.
Performance / Memory optimization mods
The most important optimization mods for Minecraft 1.12.2 can be summed up to the following list:
- CensoredASM : Huge optimizations that are targeted at Minecraft 1.12.2
- VintageFix : Load time and RAM use improvements for Minecraft 1.12.2
- Universal Tweaks : A community project to consolidate various bugfixes and tweaks into a single solution for Minecraft 1.12.2
- Stellar Core : Provides extensive bug fixes, performance improvements, and additional features across a wide range of mods
Note
Universal Tweaks supersedes a lot of mods which will not be mentioned here. This can be observed via an in-game warning or by looking at the incompatible mods list Here.
Render optimization mods
The most prominent Render optimization mods for Minecraft 1.12.2 are:
- Optifine
- Celeritas (Requires Cleanroom Loader)
- Nothirium (Also requires Naughthirium)
Note
Celeritas and Nothirium do decrease ram usage and footprint, while Optifine may increase ram usage and will lengthen load times.
Stress Test Results
In a simulated heavy-base scenario, we benchmarked the aforementioned mods against each other, and therefore rank their performance according to which gpu is used:
- NVIDIA GPUs →
Nothirium > Optifine > Celeritas - AMD GPUs →
Celeritas > Optifine > Nothirium - Intel Integrated Graphics →
Celeritas | Optifine
⚠️ Performance varies depending on your hardware and drivers. Test all three mods to see which provides the best results for your system.
Superseded mods
Note
These mods are not necessarily incompatible with Cleanroom loader, but have been superseded by newer forks or do not present any benefit, so we recommend you use to follow the actions we recommend
| Mod | Reason | Recommended Action |
|---|---|---|
| Aether II | Gets packaged with Phosphor which breaks compatibility with Alfheim Lighting Engine / Hesperus | ✅ Use Aether II: Phosphor Not Included |
| Applied Energistics 2 | Outdated | ✅ Use AE2 Unofficial Extended Life |
| BetterFPS | Breaks core functionality. | 🚫 Remove |
| Betterer Biome Blender | Minor fixes for an already useless mod. | 🚫 Remove |
| Clumps | Outdated | ✅ Use Fixeroo |
| Crimson Revelations | Outdated | ✅ Use New Crimson Revelations |
| Custom Mob Spawner | Breaks mob spawns on almost every other mod | 🚫 Remove |
| Davinci Vessels | Outdated | ✅ Use Valkyrien Skies |
| DupeFix Project | Incompatible with MixinBooter | ✅ Use Universal Tweaks |
| Eigencraft Unofficial Patch / MUP | Outdated, will cause incompats with other mods | ✅ Use Universal Tweaks |
| Embers/Embers Rekindled | Outdated, may cause issue | ✅ Use Embers Unofficial Extended Life |
| Engineered Golems | Merged into Congrega Mystica with bugs fixed | ✅ Use Congrega Mystica |
| Expanded Arcanum | Merged into Congrega Mystica with bugs fixed | ✅ Use Congrega Mystica |
| FastFurnace | Merged and rewritten in CensoredASM | ✅ Use CensoredASM |
| FermiumASM | Clone of CensoredASM, disables fixes with Dynamic Trees, depends on FermiumBooter. | ✅ Use CensoredASM |
| FermiumBooter | Clone of MixinBooter with less benefits, uses a really old mixins version, which might not be compatible with newer MixinExtras stuff. | ✅ Use MixinBooter |
| GPU Tape | Provides no benefit | 🚫 Remove |
| IC2 | Has a good amount of bugs | ✅ Use IC2 Patcher |
| JustEnoughIDs (JEID) / NotEnoughIDs (NEID) | Outdated | ✅ Use RoughlyEnoughIDs (REID) |
| JustEnoughItems (JEI) | Outdated | ✅ Use HadEnoughItems (HEI) |
| Mekanism | Outdated | ✅ Use Mekanism-CE-Unofficial or Mekanism Community Edition |
| MiniEffects | Outdated | ✅ Use MiniEffects-Legacy Extended Life |
| Mod Director | Outdated | ✅ Use FileDirector |
| Modular Machinery | Outdated | ✅ Use Modular Machinery: Community Edition |
| Mo' Creatures | Outdated, requires Custom Mob Spawner and has numerous gamebreaking bugs | ✅ Use Mo' Creatures Extended |
| MrCrayfish's Furniture Mod (Legacy) | Outdated | ✅ Use MrCrayfish's Furniture Mod (Legacy 1.12.2) |
| Multithreaded Noise | Known to cause crashes. | 🚫 Remove |
| Mutant Beasts | Outdated | ✅ Use Mutant Creatures Legacy |
| Natura | Outdated, impacts performance | ✅ Use Natura Legacy |
| Nature's Aura | Outdated, impacts performance | ✅ Use Nature's Aura Simplified |
| Noisethreader | Known to cause crashes and mismatched registries. | 🚫 Remove |
| NormalASM | Outdated fork of CensoredASM with no meaningful changes. | ✅ Use CensoredASM |
| OpenBlocks | Outdated | ✅ Use OpenBlocks Reopened |
| Performant | Empty jar, does nothing. | 🚫 Remove |
| Pillar | Outdated | ✅ Use Pillar Patched |
| Redirectionor | Provides no real performance benefit. | 🚫 Remove |
| Relictium | See Performance Mods. | — |
| Rustic Thaumaturgy | Merged into Congrega Mystica with bugs fixed | ✅ Use Congrega Mystica |
| Seared Ladder (Backport) | Merged into Tinkers' Antique | ✅ Use Tinkers' Antique |
| SmoothFont | Breaks some mods. | 🚫 Remove |
| Soul Shards Respawn | Outdated | ✅ Use Soul Shards Respawn Patched |
| Spark / Spark Unforged | Spark: Outdated Spark Unforged: Backport of modern Spark with half the features removed. | ✅ Use Flare |
| Surge | Uses deprecated methods, does not improve performance at all | ✅ Use Universal Tweaks |
| Techguns | Outdated and unfinished | ✅ Use Techguns-CE |
| ThaumTweaks | Outdated and problematic mod, will cause incompats with other mods | ✅ Use ThaumicTweaker |
| Thaumic Fixes | Only fixes one bug, may cause incompats with other mods | ✅ Use Thaumcraft Fix |
| Thaumic Wonders | Outdated | ✅ Use Thaumic Wonders Unofficial |
| Tinkers Construct | Outdated | ✅ Use Tinker's Antique |
| Tough Expansion | Has an RCE exploit | ✅ Use Survival Tools |
Thermonuclear_Minecraft_Engineer