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    2,054,198 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 2026.269,438 projects gradedProjects with a letter from A to F. Counted on 25 Oct 2026.
    How it worksMalware we foundAPIAboutPrivacyTermsContact

    © 2026 ModgradeNot an official Minecraft product. Not approved by or associated with Mojang or Microsoft.

    Marlow's Crystal Optimizer

    Mod

    Place another end crystal sooner after breaking one.

    A98/ 100
    • OverviewA
    • SecurityPassed
    • PrivacyGoes online
    • AINone found
    • CompatibilityUp to 26.3
    • ModpacksIn 550
    • ReleasesLatest 7 Oct

    Download

    marlows-crystal-optimizer-2.0.0+mc26.1-26.3.jar

    Released 7 Oct 2026 · 150.4 KB

    Passed: our checks found nothing harmful in this file.

    Download

    Required to run

    • Fabric APIAMinecraft 26.3 · Fabric (release 0.165.0)
    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

    • Some modpacks removed it−1 point
    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.3 weeks ago (7 Oct 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 on Fabric and NeoForge (latest) 9 / 9
      Regular releasesIn how many of the last 24 months a new file came out. Full points at 8 months.Releases in 8 of the last 24 months 6 / 6

    • Stability

      1 point lost21 / 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.34 of the 248 modpacks with two or more versions removed it in a later one (14%) See the 34 modpacks9 / 10
      Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.1 of its 12 releases in 2 years needed a quick fix (8%) 7 / 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 · Bram1903/MarlowsCrystalOptimizer 7 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.GitHub issues · Bram1903/MarlowsCrystalOptimizer 3 / 3

    • Popularity

      Full points4 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.5,478,015 4 / 4

    • Track record

      Full points8 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.21 months, 32 releases 8 / 8

    • Security

      Passed
      File checksThis check adds no points. It can only take points away.Our checks found nothing harmful in all 9 latest files for recent Minecraft versions. See Security
    Total98 / 100

    69.8 of the 71 points that apply = 98 out of 100. The points above are rounded to whole numbers.

    About

    Marlow's Crystal Optimizer speeds up repeated end-crystal placement by hiding a crystal on the client as soon as it is hit, rather than waiting for the server to remove it, which can reduce the felt delay on higher-ping connections. The broken crystal stops blocking the next end-crystal placement while remaining in the way of other interactions, so the change does not let clicks break blocks beneath it or reach players behind it. An optional Keep Render setting leaves the broken crystal visible until the server removes it, while still allowing the next crystal to be placed in its spot. Servers can disable the optimizer for a connection.

    Written from Modrinth , CurseForge and the GitHub README . How we write it

    In-game changes

    Changes the game's code in 5 areas: Server and world logicChanges 2 game code files in this area: the world, commands, scoreboards, saved data and game rules., PlayerChanges 1 game code file in this area: your character: movement, abilities, hunger and controls., Inventory and itemsChanges 1 game code file in this area: items, chests and other containers, crafting and enchanting., Mobs and their behaviorChanges 1 game code file in this area: mobs, animals, villagers, projectiles and how they move and act. and Game coreChanges 1 game code file in this area: the main loop, lighting and other code the whole game uses..

    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
    Mod MenuALithiumAFerriteCoreASodium ExtraAReese's Sodium OptionsA

    Details

    Creators
    DevBram, Pathdos and Legertje08
    License
    MIT License
    Downloads
    5.5M
    Created
    20 Jan 2025
    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.

    What it can do on your computer

    Connects to the internet
    It has code that can go online, for example to check for updates, load skins or send crash reports. It contacts 2 web addresses. See Privacy
    Creates settings files
    The mod keeps its settings in the config folder of your game, where you can change or delete them. 1 file in your config folder.

    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 12 latest files checked, last on 15 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.
      12 latest files: the newest file for each Minecraft version and loader. The answer above is about the 9 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.
      Folders outside the game, other programs, updating itself, the webcam or microphone, an AI service.

    Privacy

    We found nothing it sends about you

    We read its code without running it: it contacts 2 web addresses while you play.

    Like any connection, each address it contacts sees your IP address.

    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 9 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 9 files, for recent Minecraft versions. See each file in Releases
    • api.modrinth.com
      Checks for a new version of the mod.
    • Address built while the game runsThe code builds this address while the game runs: it is not written in the file.
      Checks for a new version of the mod.Explained by AI (may be wrong)Explained by an AI from the code. May be wrong.
    • 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
      38 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
      48 code files read

    Compatibility

    See all 32 files
    Fabric
    NeoForge
    1.191.201.2126.1

    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 in your game only. Servers do not need it, so you can join any server.
    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 APIon FabricA
    OptionalProjects it can work with but does not need. The author lists them.
    Mod Menuon FabricAYetAnotherConfigLib (YACL)in some filesA
    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.Slower than most mods. On average, it gets a file 63 days after a new Minecraft version comes out. Measured on the last 6 Minecraft versions.

    Modpacks using this project

    Find modpacks with it
    Modpacks that released a new version with this project, each month
    100500
    Oct 2024: 0 modpacksNov 2024: 0 modpacksDec 2024: 0 modpacksJan 2025: 0 modpacksFeb 2025: 4 modpacksMar 2025: 12 modpacksApr 2025: 13 modpacksMay 2025: 18 modpacksJun 2025: 19 modpacksJul 2025: 28 modpacksAug 2025: 30 modpacksSep 2025: 41 modpacksOct 2025: 46 modpacksNov 2025: 50 modpacksDec 2025: 71 modpacksJan 2026: 79 modpacksFeb 2026: 75 modpacksMar 2026: 77 modpacksApr 2026: 61 modpacksMay 2026: 74 modpacksJun 2026: 100 modpacksJul 2026: 81 modpacksAug 2026: 62 modpacksSep 2026: 51 modpacks
    Oct 2024Oct 2025Sep 2026
    Modpacks that released a new version with this project, each month
    Oct 20240
    Nov 20240
    Dec 20240
    Jan 20250
    Feb 20254
    Mar 202512
    Apr 202513
    May 202518
    Jun 202519
    Jul 202528
    Aug 202530
    Sep 202541
    Oct 202546
    Nov 202550
    Dec 202571
    Jan 202679
    Feb 202675
    Mar 202677
    Apr 202661
    May 202674
    Jun 2026100
    Jul 202681
    Aug 202662
    Sep 202651

    More modpacks put it in their new versions than a year ago: 72 a month now, 25 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..

    550 modpacks include Marlow's Crystal Optimizer in at least one of their versions. Here are the 30 most downloaded.

    ModpackDownloadsLast version with it
    Everything Voxy255K downloadslast version with it 10 Dec 2025The Ultimate PvP Modpack (UPDATED!)161K downloadslast version with it 5 Sep 2026Crystal Client149K downloadslast version with it 15 Sep 2026FrostClient132K downloadslast version with it 16 Oct 2026Spunky's Better CPVP78K downloadslast version with it 22 Oct 2026PvP Optimized74K downloadslast version with it 29 Sep 2026EZ FPS And The Features For Pojav/Mojo/Zalith69K downloadslast version with it 19 Jul 2026DUNQOL67K downloadslast version with it 2 Jun 2026Kuri's Fresh (Actions & Stuffs recreation)64K downloadslast version with it 20 Oct 2026CreatorSMP64K downloadslast version with it 3 Nov 2025
    1 to 10 of 30123

    Often in the same modpacks

    Mods that modpacks often add together with Marlow's Crystal Optimizer. Share: how many of the modpacks with Marlow's Crystal Optimizer also have that mod.

    ProjectTypeShareGrade
    Mod MenuAModin 97% of the modpacks with Marlow's Crystal OptimizerLithiumAModin 97% of the modpacks with Marlow's Crystal OptimizerFerriteCoreAModin 95% of the modpacks with Marlow's Crystal OptimizerSodium ExtraAModin 87% of the modpacks with Marlow's Crystal OptimizerReese's Sodium OptionsAModin 78% of the modpacks with Marlow's Crystal OptimizerDynamic FPSAModin 75% of the modpacks with Marlow's Crystal OptimizerBadOptimizationsAModin 74% of the modpacks with Marlow's Crystal OptimizerZoomify (Zoom)AModin 71% of the modpacks with Marlow's Crystal OptimizerKryptonAModin 70% of the modpacks with Marlow's Crystal OptimizerShulker Box TooltipAModin 69% of the modpacks with Marlow's Crystal 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
    26.1 to 26.3·Fabric2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc26.1-26.3.jarSends: Nothing about youRequires:Fabric APIPassedOur checks found nothing harmful in this file. Its code was read too.
    26.1 to 26.3·NeoForge2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc26.1-26.3-neoforge.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.11·Fabric2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.21.11.jarSends: Nothing about youRequires:Fabric APIPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.11·NeoForge2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.21.11-neoforge.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.5 to 1.21.10·Fabric2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.21.5-1.21.10.jarSends: Nothing about youRequires:Fabric APIPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.5 to 1.21.10·NeoForge2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.21.5-1.21.10-neoforge.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.5 to 1.21.4·Fabric2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.20.5-1.21.4.jarSends: Nothing about youRequires:Fabric APIPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21 to 1.21.4·NeoForge2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.21-1.21.4-neoforge.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.19 to 1.20.1·Fabric2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.19-1.20.1.jarSends: Nothing about youRequires:Fabric APIPassedOur checks found nothing harmful in this file. Its code was read too.
    Older Minecraft versions
    1.20.5 to 1.20.6·NeoForge2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.20.5-1.20.6-neoforge.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1 to 10 of 1212

    32 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    26.1 to 26.326.1 to 26.3The latest file for its Minecraft version and loader·Fabric2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc26.1-26.3.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 150.4 KB
    26.1 to 26.326.1 to 26.3The latest file for its Minecraft version and loader·NeoForge2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc26.1-26.3-neoforge.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 148.2 KB
    1.21.11The latest file for its Minecraft version and loader·Fabric2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.21.11.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 150.2 KB
    1.21.11The latest file for its Minecraft version and loader·NeoForge2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.21.11-neoforge.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 148.3 KB
    1.21.5 to 1.21.101.21.5 to 1.21.10The latest file for its Minecraft version and loader·Fabric2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.21.5-1.21.10.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 150.2 KB
    1.21.5 to 1.21.101.21.5 to 1.21.10The latest file for its Minecraft version and loader·NeoForge2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.21.5-1.21.10-neoforge.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 148.3 KB
    1.20.5 to 1.21.41.20.5 to 1.21.4The latest file for its Minecraft version and loader·Fabric2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.20.5-1.21.4.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 150.2 KB
    1.21 to 1.21.41.21 to 1.21.4The latest file for its Minecraft version and loader·NeoForge2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.21-1.21.4-neoforge.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 148.3 KB
    1.20.5 to 1.20.61.20.5 to 1.20.6The latest file for its Minecraft version and loader·NeoForge2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.20.5-1.20.6-neoforge.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 148.3 KB
    1.20.2 to 1.20.41.20.2 to 1.20.4The latest file for its Minecraft version and loader·Fabric2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.20.2-1.20.4.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 142.5 KB
    1.20.4The latest file for its Minecraft version and loader·NeoForge2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.20.4-neoforge.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 142.8 KB
    1.19 to 1.20.11.19 to 1.20.1The latest file for its Minecraft version and loader·Fabric2.0.02.0.0 · marlows-crystal-optimizer-2.0.0+mc1.19-1.20.1.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 138.8 KB
    26.1 to 26.326.1 to 26.3·Fabric1.1.01.1.0 · Marlow Crystal Optimizer.jar (main file)·5 May 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 110.6 KB
    1.21.11·Fabric1.1.01.1.0 · Marlow Crystal Optimizer.jar (main file)·5 May 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 111.5 KB
    1.21.5 to 1.21.101.21.5 to 1.21.10·Fabric1.1.01.1.0 · Marlow Crystal Optimizer.jar (main file)·5 May 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 111.9 KB
    1.20.5 to 1.21.41.20.5 to 1.21.4·Fabric1.1.01.1.0 · Marlow Crystal Optimizer.jar (main file)·5 May 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 111.9 KB
    1.20.2 to 1.20.41.20.2 to 1.20.4·Fabric1.1.01.1.0 · Marlow Crystal Optimizer.jar (main file)·5 May 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 106.0 KB
    1.19 to 1.20.11.19 to 1.20.1·Fabric1.1.01.1.0 · Marlow Crystal Optimizer.jar (main file)·5 May 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 105.1 KB
    26.1 to 26.1.226.1 to 26.1.2·Fabric1.0.61.0.6 · Marlow's Crystal Optimizer-26.1-1.0.6.jar (main file)·24 Mar 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthNot on CurseForgeDownload · Stable · 105.1 KB
    1.21.11·Fabric1.0.51.0.5 · Marlow's Crystal Optimizer-1.21.11-1.0.5.jar (main file)·6 Jan 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthNot on CurseForgeDownload · Stable · 106.1 KB
    1 to 20 of 3212

    Quick fixes

    In the last 2 years, 1 release needed a quick fix: a new release within 3 days to fix a problem. This counts in the grade, but it is too few to lose points.

    See them, newest first

    Quick fixesReleases followed within 3 days by a new release that fixes a problem in them.1

    • 1.0.122 Jan 2025Fixed Incompatibility with many clients due to not using a…