
SlimLine
A lightweight modpack for Legacy Fabric 1.8.9 that aims to simplify, optimize, and refine the vanilla experience
Screenshots

About this Modpack
SlimLine 1.8.9
SlimLine is a lightweight modpack for Legacy Fabric 1.8.9 that aims to simplify, optimize, and refine the vanilla experience.
It is designed to be as unobtrusive and stable as possible, while offering notable performance improvements (especially for older machines), together with some quality-of-life enhancements.
Due to its nature, SlimLine should be fully interoperable with vanilla, allowing servers and clients to connect with each other seamlessly.
Made and tested with Prism Launcher. Compatibility with other launchers wasn't tested.
Feature List
Performance Optimization
Through Alternate Current, Phosphor-Legacy, Ksyxis, and SleepBackground, the performance of the game is optimized while conserving behavior and compatibility.
Mipmaplevel and Language Fix makes changing language nearly instant.
Ksyxis can be disabled if you need to use the spawn chunks functionality (e.g. for automatic mob farms that require it).
Note: Optifine could be added to the modpack (through Legacy Optifabric), but it was left out to better preserve vanilla behavior and interface.
Bug Fixes
Legacy VanillaFix, legacy-crash-fix, and MouseDelayFix-fabric are used to fix small bugs within the game, such as the hand glitching when riding minecarts, and cursor inaccuracies when moving the mouse quickly with low fps.
Improvements
- TabFocus brings keyboard control to select and click buttons in the game menus;
- Realms Button Remover helps to clear up the title screen;
- Legacy Better Ping Display adds ping values in the multiplayer tab menu;
- legacy chunk borders brings the modern chunk border view with F3 + G;
- Show My Hunger makes the hunger bar visible when riding a boat or minecart.
- Extra Options backports the distortion effects and FOV effects accessibility settings.
- Don't Clear Chat History makes it so chat history isn't cleared after disconnecting and relogging to a server.
- MenuFPSUnlocker raises the frame rate of the main menu from 30fps to 120fps.
Title Screen Preview

As stated, no Realms button, as well as no mod menu button, to keep the interface clean ;)
Icon created with TextStudio and GIMP
Available Versions
How to Set Up a SlimLine Server
Order Server
Choose at least 4 GB RAM (6 GB recommended for SlimLine). Based on player count: per 8 players.
Install Modpack in Dashboard
Open the modpack browser in the dashboard, search for "SlimLine" and click "Install". The fabric loader and Minecraft 1.8.9 are configured automatically.
Start Server & Play
Start the server – all mods are loaded automatically. Share the server IP with friends and play together!
Frequently Asked Questions
SlimLine server crashes or won't start – what to do?
Most common causes: insufficient RAM or wrong fabric loader. Check latest.log for "OutOfMemoryError" → increase RAM to at least 6 GB. For "Mixin" or "ClassNotFoundException" errors: modpack version and loader don't match. With Mado Hosting, loader and Minecraft version are auto-configured on modpack install – preventing most startup issues.
How much RAM does a SlimLine server really need?
Minimum 4 GB, recommended 6 GB for stable performance. per 8 players. Important: Minecraft modpacks need more RAM than vanilla – plan extra per additional player. With Mado Hosting, you can scale RAM up live at any time without data loss (from €8/month).
Can I add custom mods to SlimLine without conflicts?
Yes, but check compatibility: only use mods for the same loader (fabric) and same Minecraft version (1.8.9). Common issues: ID conflicts with recipe mods and incompatible coremod versions. The Mado dashboard mod browser only shows compatible mods and warns about known conflicts.
SlimLine server lagging – performance tips
1) Increase RAM to 6 GB+. 2) Reduce server view-distance to 8 (server.properties). 3) Pre-generate chunks with the "Chunky" plugin. 4) Use /spark profiler to check which mods consume the most tick time. With Mado Hosting, all servers run on NVMe SSDs with dedicated CPU cores – eliminating hardware as a bottleneck.
Rent SlimLine Server
Start your own server with automatic modpack installation.
Supported Versions
Start your SlimLine Server now
From €8.00/month with 6 GB RAM for the best performance.
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