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    2,055,424 files checkedFiles from Modrinth and CurseForge we downloaded and checked. Counted on 25 Oct 2026.636,163 files with their code readFiles whose code we turned back into readable code and read, in an isolated environment. Counted on 25 Oct 2026.269,392 projects gradedProjects with a letter from A to F. Counted on 25 Oct 2026.
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    © 2026 ModgradeNot an official Minecraft product. Not approved by or associated with Mojang or Microsoft.

    Structure Layout Optimizer

    Mod

    Makes large generated structures appear faster with fewer lag spikes.

    A97/ 100
    • OverviewA
    • SecurityPassed
    • PrivacyNone found
    • AINone found
    • CompatibilityUp to 26.3
    • ModpacksIn 2,993
    • ReleasesLatest 16 Sep

    Download

    structure_layout_optimizer-1.1.4+26.3-fabric.jar

    Released 16 Sep 2026 · 68.1 KB

    Passed: our checks found nothing harmful in this file.

    Download

    Required to run

    • Fabric APIAMinecraft 26.3 · Fabric (release 0.165.0)
    • Resourceful ConfigAMinecraft 26.3 · Fabric (release 6.0.2)
    OverviewSecurityPrivacyAICompatibilityModpacksReleases

    Why grade A

    How grades work

    Strengths

    • Security checks passed
    • Regular releases for the newest Minecraft versions
    • Public source code and issue tracker
    • Widely used
    • Around for years

    Points lost

    • Releases replaced within 3 days to fix a problem−2 points
    All 11 criteria

    • Maintenance

      Full points27 / 27
      Last releaseHow long ago the newest file came out, or an existing file was marked as working on a new Minecraft version.6 weeks ago (16 Sep 2026) 12 / 12
      Supports popular versionsWhether the project has a file for a Minecraft version that 15% or more of the popular mods updated in the last 6 months also support. A version many modpacks use, like 1.20.1 or 1.21.1, also counts after a release in the last 12 months.26.3 (latest) on Fabric and NeoForge, 1.20.1 on Forge 9 / 9
      Regular releasesIn how many of the last 24 months a new file came out. Full points at 8 months.Releases in 11 of the last 24 months 6 / 6

    • Stability

      2 points lost20 / 22
      Removed from modpacksHow many modpacks removed it in a later version of the pack. We can only see this in modpacks with two or more versions. A pack that swaps it for another edition of the same project, or that is rebuilt from scratch, does not count.20 of the 378 modpacks with two or more versions removed it in a later one (5%) 10 / 10
      Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.4 of its 21 releases in 2 years needed a quick fix (19%) See the 4 releases5 / 7
      Known conflictsHow many projects say they do not work with it, compared with how widely it is used. Packs, small projects, forks, ports, add-ons, alternatives and old versions do not count.None 5 / 5

    • Transparency

      Full points10 / 10
      Source codeWhether the project page links to its source code, so anyone can read what it does.GitHub · TelepathicGrunt/StructureLayoutOptimizer 7 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.GitHub issues · TelepathicGrunt/StructureLayoutOptimizer 3 / 3

    • Popularity

      Full points4 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.39,024,808 4 / 4

    • Track record

      Full points8 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.2.2 years, 89 releases 8 / 8

    • Security

      Passed
      File checksThis check adds no points. It can only take points away.Our checks found nothing harmful in all 18 latest files for recent Minecraft versions. See Security
    Total97 / 100

    68.9 of the 71 points that apply = 97 out of 100. The points above are rounded to whole numbers.

    About

    Structure Layout Optimizer speeds up the generation of Jigsaw structures and NBT structure pieces while aiming to leave their appearance unchanged. For layouts with many pieces, it uses a BoxOctree to check new pieces for intersections only against nearby pieces, and skips futile child-piece checks when a Jigsaw Block is blocked off. It also streamlines Jigsaw Block matching and property lookups, and avoids repeating placement checks for weighted template-pool elements already found unable to fit at a given location. For large NBT pieces without processors that require whole-piece data, it checks chunk bounds early and processes only positions relevant to the chunk, reducing unnecessary loading and work. An optional setting can deduplicate shuffled template-pool elements for additional gains with high-weight entries, but may produce a different valid structure layout than vanilla for the same seed. On supported versions, the mod can also store cached structure-template palette data in a smaller form between world-generation tasks, rebuilding the full list when needed to reduce memory use.

    Written from Modrinth . How we write it

    In-game changes

    Changes the game's code in 1 area: World generationChanges 5 game code files in this area: terrain, biomes and structures made when new land is created..

    Adds no new blocks, items or other content.

    Keeps all of vanilla Minecraft's textures, models and sounds.

    Often used with it

    See all 30
    BadOptimizationsAsparkAPacket FixerAChat HeadsAAttributeFixA

    Details

    Creator
    TelepathicGrunt
    License
    MIT License
    Downloads
    39M
    Created
    20 Aug 2024
    Official pages
    Modrinth , CurseForge
    Links
    Source code , Issues , Discord

    Security

    No harmful code found

    We checked its files and read their code, without running it.

    Why we show this: a mod runs on your computer like any program, so harmful code in it can take your accounts or files. Our checks look for known signs of harm. They cannot prove that a file is harmless. In the grade: malware means no grade, and a Warning in a latest file for a recent Minecraft version lowers it.

    How we checked · All 27 latest files checked, last on 16 Oct 2026
    • FilesWe download the files from Modrinth or CurseForge and look at what is inside them and what their code can do, without running them. Fixed rules tell what is harmful.
      27 latest files: the newest file for each Minecraft version and loader. The answer above is about the 18 for recent versions. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks. See each file in Releases
    • Their codeWe turn the code of the files back into readable code and follow what it does, without running it. This shows what it downloads, what it sends and where your login goes.
      Read without running it
    • Author on ModrinthThe disclosure form on Modrinth, where the author declares that the project reads or edits things on your system outside the game. Since 13 Aug 2026, Modrinth's rules require it when this applies.
      Nothing declared about your system outside the game.
    • Looked for, not foundWe looked for these in the file and did not find them.
      The internet, folders outside the game, other programs, updating itself, the webcam or microphone, an AI service.

    Privacy

    We found nothing it sends

    We read its code without running it: it contacts no web address while you play.

    Why we show this: a mod can send things about you over the internet, like your player name or your login. Contacting an address to check for updates or download files sends nothing about you. Not in the grade: sending data can be normal for what a mod does.

    How we checked · All 18 files read
    • Files readWe read the code without running it. We list each web address the code contacts while you play, and what it sends. Code that is never used is left out.
      The code of all 18 files, for recent Minecraft versions. See each file in Releases
    • Author on ModrinthThe disclosure form on Modrinth, where the author declares crash reports, usage data and advertisements. Since 13 Aug 2026, Modrinth's rules require it when a project collects data on its users or shows advertisements.
      Nothing declared about crash reports, usage data or advertisements.

    AI

    No sign that AI was used to make it

    We looked for AI tools in its texts, files, images and code history and found none.

    No sign of AI in the game

    We found no AI service, AI library or AI model file in its code.

    Why we show this: some players and servers avoid projects made with AI, and AI in the game can send what you write to an online service. Not in the grade: using AI does not tell whether a project works well or is kept up to date.

    How we checked · 6 places read
    • Author on ModrinthThe disclosure form on Modrinth. Since 13 Aug 2026, Modrinth's rules require it when a substantial part of the code is AI output, when an asset is mainly AI output, or when the project or its page relies on generative AI.
      No AI content or AI features declared.
    • Code historyThe public code on GitHub: who made each change, credit lines such as "Co-authored-by", and its files.
      Nothing found
    • Description and changelogsThe description, project page and newest changelogs: sentences saying an AI tool was used, and text pasted from an AI chat.
      Nothing found
      40 changelogs read
    • Its filesFiles that AI coding tools leave behind (like AGENTS.md), and the texts inside the files you download.
      Nothing found
    • Images in its filesHidden data in the images of the files you download, where AI image tools write their name and settings.
      Nothing found
      1 image read
    • Code of the modThe code and files of the mod, read without running it: addresses of AI services, AI libraries, AI model files and a place for your own AI key.
      No AI service, AI library or AI model file
      20 code files read

    Compatibility

    See all 89 files
    Fabric
    NeoForge
    Forge
    1.161.181.201.2126.1

    Point at or tap a version to see its loaders.

    Runs onWhere to install it: in your game, on the server, or both. As the author says on Modrinth.Install it on the server. Players join without installing it. It also works in singleplayer.
    RequiresProjects you must also install for it to work. From the author's lists for its files for recent Minecraft versions, or from its project page.
    Fabric APIin some filesAResourceful ConfigA
    OptionalProjects it can work with but does not need. The author lists them.Nothing
    IncludesProjects packed inside its files.Nothing
    Speed of updatesHow fast it gets a file for new Minecraft versions, on average, compared with similar projects. Not part of the grade.Faster than most mods. On average, it gets a file 16 days after a new Minecraft version comes out. Measured on the last 6 Minecraft versions.

    Related projects

    Projects that need Structure Layout Optimizer to work.

    ProjectTypeDownloadsGrade
    Final AdversariesEMod14K downloadsLarge Structure LibBMod201 downloads

    Modpacks using this project

    Find modpacks with it
    Modpacks that released a new version with this project, each month
    6003000
    Oct 2024: 4 modpacksNov 2024: 20 modpacksDec 2024: 53 modpacksJan 2025: 95 modpacksFeb 2025: 98 modpacksMar 2025: 118 modpacksApr 2025: 138 modpacksMay 2025: 173 modpacksJun 2025: 209 modpacksJul 2025: 184 modpacksAug 2025: 204 modpacksSep 2025: 236 modpacksOct 2025: 249 modpacksNov 2025: 259 modpacksDec 2025: 305 modpacksJan 2026: 327 modpacksFeb 2026: 302 modpacksMar 2026: 344 modpacksApr 2026: 365 modpacksMay 2026: 419 modpacksJun 2026: 440 modpacksJul 2026: 497 modpacksAug 2026: 511 modpacksSep 2026: 577 modpacks
    Oct 2024Oct 2025Sep 2026
    Modpacks that released a new version with this project, each month
    Oct 20244
    Nov 202420
    Dec 202453
    Jan 202595
    Feb 202598
    Mar 2025118
    Apr 2025138
    May 2025173
    Jun 2025209
    Jul 2025184
    Aug 2025204
    Sep 2025236
    Oct 2025249
    Nov 2025259
    Dec 2025305
    Jan 2026327
    Feb 2026302
    Mar 2026344
    Apr 2026365
    May 2026419
    Jun 2026440
    Jul 2026497
    Aug 2026511
    Sep 2026577

    More modpacks put it in their new versions than a year ago: 468 a month now, 191 a year agoThe average of the last 6 months, compared with the same 6 months a year before. We say it only when the change is large..

    2,993 modpacks include Structure Layout Optimizer in at least one of their versions. Here are the 30 most downloaded.

    ModpackDownloadsLast version with it
    Better MC [FORGE] - BMC421.1M downloadslast version with it 9 Oct 2026Cave Horror Project 18.2M downloadslast version with it 1 Oct 2026Better MC [FABRIC] - BMC25.9M downloadslast version with it 15 Jul 2026Better MC [FORGE] BMC15.8M downloadslast version with it 22 Jun 2025Immersed With Shaders4.5M downloadslast version with it 26 Mar 2026Homestead3.6M downloadslast version with it 23 Oct 2026Better MC [NEOFORGE] BMC53.3M downloadslast version with it 8 Sep 2026SteamPunk [LPS]3M downloadslast version with it 20 May 2026Fear Nightfall: Remains of Chaos2.9M downloadslast version with it 13 Sep 2025BigChadGuys Plus2.4M downloadslast version with it 14 Oct 2026
    1 to 10 of 30123

    Often in the same modpacks

    Mods that modpacks often add together with Structure Layout Optimizer. Share: how many of the modpacks with Structure Layout Optimizer also have that mod.

    ProjectTypeShareGrade
    BadOptimizationsAModin 69% of the modpacks with Structure Layout OptimizersparkAModin 62% of the modpacks with Structure Layout OptimizerPacket FixerAModin 61% of the modpacks with Structure Layout OptimizerChat HeadsAModin 55% of the modpacks with Structure Layout OptimizerAttributeFixAModin 54% of the modpacks with Structure Layout OptimizerParticle CoreAModin 53% of the modpacks with Structure Layout OptimizerAmendmentsAModin 52% of the modpacks with Structure Layout Optimizerfix GPU memory leakAModin 50% of the modpacks with Structure Layout OptimizerLithiumAModin 49% of the modpacks with Structure Layout OptimizerAllTheLeaks (Memory Leak Fix)AModin 49% of the modpacks with Structure Layout Optimizer
    1 to 10 of 30123

    Latest files

    The newest file for each Minecraft version and loader. The files for recent versions come first. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks.

    MinecraftLoaderVersionSecuritySendsRequires
    26.3·Fabric1.1.41.1.4 · structure_layout_optimizer-1.1.4+26.3-fabric.jarSends: None foundRequires:Fabric API, Resourceful ConfigFabric API, Resourceful ConfigPassedOur checks found nothing harmful in this file. Its code was read too.
    26.3·NeoForge1.1.41.1.4 · structure_layout_optimizer-1.1.4+26.3-neoforge.jarSends: None foundRequires:Resourceful ConfigPassedOur checks found nothing harmful in this file. Its code was read too.
    26.1 to 26.2·Fabric1.1.41.1.4 · structure_layout_optimizer-1.1.4+26.1-fabric.jarSends: None foundRequires:Resourceful Config, Fabric APIResourceful Config, Fabric APIPassedOur checks found nothing harmful in this file. Its code was read too.
    26.1 to 26.2·NeoForge1.1.41.1.4 · structure_layout_optimizer-1.1.4+26.1-neoforge.jarSends: None foundRequires:Resourceful ConfigPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.11·Fabric1.1.41.1.4 · structure_layout_optimizer-1.1.4+1.21.11-fabric.jarSends: None foundRequires:Fabric API, Resourceful ConfigFabric API, Resourceful ConfigPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.11·NeoForge1.1.41.1.4 · structure_layout_optimizer-1.1.4+1.21.11-neoforge.jarSends: None foundRequires:Resourceful ConfigPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.9 to 1.21.10·Fabric1.1.41.1.4 · structure_layout_optimizer-1.1.4+1.21.9-fabric.jarSends: None foundRequires:Resourceful Config, Fabric APIResourceful Config, Fabric APIPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.9 to 1.21.10·NeoForge1.1.51.1.5 · structure_layout_optimizer-1.1.5+1.21.9-neoforge.jarSends: None foundRequires:Resourceful ConfigPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.6 to 1.21.8·Fabric1.1.41.1.4 · structure_layout_optimizer-1.1.4+1.21.6-fabric.jarSends: None foundRequires:Fabric API, Resourceful ConfigFabric API, Resourceful ConfigPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.6 to 1.21.8·NeoForge1.1.41.1.4 · structure_layout_optimizer-1.1.4+1.21.6-neoforge.jarSends: None foundRequires:Resourceful ConfigPassedOur checks found nothing harmful in this file. Its code was read too.
    1 to 10 of 27123

    89 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    26.3The latest file for its Minecraft version and loader·Fabric1.1.41.1.4 · structure_layout_optimizer-1.1.4+26.3-fabric.jar (main file)·16 Sep 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 68.1 KB
    26.3The latest file for its Minecraft version and loader·NeoForge1.1.41.1.4 · structure_layout_optimizer-1.1.4+26.3-neoforge.jar (main file)·16 Sep 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 67.5 KB
    1.21.9 to 1.21.101.21.9 to 1.21.10The latest file for its Minecraft version and loader·NeoForge1.1.51.1.5 · structure_layout_optimizer-1.1.5+1.21.9-neoforge.jar (main file)·17 Jun 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 68.2 KB
    26.1 to 26.226.1 to 26.2The latest file for its Minecraft version and loader·NeoForge1.1.41.1.4 · structure_layout_optimizer-1.1.4+26.1-neoforge.jar (main file)·25 Mar 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 68.3 KB
    26.1 to 26.226.1 to 26.2The latest file for its Minecraft version and loader·Fabric1.1.41.1.4 · structure_layout_optimizer-1.1.4+26.1-fabric.jar (main file)·25 Mar 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 69.8 KB
    1.21.11The latest file for its Minecraft version and loader·NeoForge1.1.41.1.4 · structure_layout_optimizer-1.1.4+1.21.11-neoforge.jar (main file)·9 Jan 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 68.2 KB
    1.21.11The latest file for its Minecraft version and loader·Fabric1.1.41.1.4 · structure_layout_optimizer-1.1.4+1.21.11-fabric.jar (main file)·9 Jan 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 68.8 KB
    1.21.9 to 1.21.101.21.9 to 1.21.10·NeoForge1.1.41.1.4 · structure_layout_optimizer-1.1.4+1.21.9-neoforge.jar (main file)·9 Jan 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 68.2 KB
    1.21.9 to 1.21.101.21.9 to 1.21.10The latest file for its Minecraft version and loader·Fabric1.1.41.1.4 · structure_layout_optimizer-1.1.4+1.21.9-fabric.jar (main file)·9 Jan 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 69.0 KB
    1.21.6 to 1.21.81.21.6 to 1.21.8The latest file for its Minecraft version and loader·NeoForge1.1.41.1.4 · structure_layout_optimizer-1.1.4+1.21.6-neoforge.jar (main file)·9 Jan 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 68.1 KB
    1.21.6 to 1.21.81.21.6 to 1.21.8The latest file for its Minecraft version and loader·Fabric1.1.41.1.4 · structure_layout_optimizer-1.1.4+1.21.6-fabric.jar (main file)·9 Jan 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 69.0 KB
    1.21.5The latest file for its Minecraft version and loader·NeoForge1.1.41.1.4 · structure_layout_optimizer-1.1.4+1.21.5-neoforge.jar (main file)·9 Jan 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 68.1 KB
    1.21.5The latest file for its Minecraft version and loader·Fabric1.1.41.1.4 · structure_layout_optimizer-1.1.4+1.21.5-fabric.jar (main file)·9 Jan 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 69.0 KB
    1.21.4The latest file for its Minecraft version and loader·NeoForge1.1.41.1.4 · structure_layout_optimizer-neoforge-1.1.4.jar (main file)·9 Jan 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 68.2 KB
    1.21.4The latest file for its Minecraft version and loader·Fabric1.1.41.1.4 · structure_layout_optimizer-fabric-1.1.4.jar (main file)·9 Jan 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 69.1 KB
    1.21.1The latest file for its Minecraft version and loader·NeoForge1.0.121.0.12 · structure_layout_optimizer-neoforge-1.0.12.jar (main file)·9 Jan 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 60.3 KB
    1.21.1The latest file for its Minecraft version and loader·Fabric1.0.121.0.12 · structure_layout_optimizer-fabric-1.0.12.jar (main file)·9 Jan 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 61.1 KB
    1.21.11·NeoForge1.1.31.1.3 · structure_layout_optimizer-1.1.3+1.21.11-neoforge.jar (main file)·10 Dec 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 68.2 KB
    1.21.11·Fabric1.1.31.1.3 · structure_layout_optimizer-1.1.3+1.21.11-fabric.jar (main file)·10 Dec 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 68.8 KB
    1.21.9 to 1.21.101.21.9 to 1.21.10·NeoForge1.1.31.1.3 · structure_layout_optimizer-1.1.3+1.21.9-neoforge.jar (main file)·22 Oct 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 68.2 KB
    1 to 20 of 8912345

    Quick fixes

    In the last 2 years, 4 releases needed a quick fix: a new release within 3 days to fix a problem. This lowers the grade by 2 points.

    See them, newest first

    Quick fixesReleases followed within 3 days by a new release that fixes a problem in them.4

    • 1.1.1+1.21.4-fabric28 Jan 2025v1.1.1 Fixed bug in last memory optimization where I made a field…
    • 1.0.7+1.19.2-forge1 Jan 2025FORGE: Fixed jar file's mixin remap not being built correctly…
    • 1.0.9+1.20.1-forge31 Dec 2024…the conversion to Legacy ModDevGradle FORGE: Fixed Forge jar not working due to ForgeGradle being broken junk…
    • 1.0.6+1.20.1-fabric30 Dec 2024…have excessive amounts of Jigsaw Blocks. Fixed a rare and obscure bug with this mod where a structure…