RimWorld: Best Prefs.xml for Advanced Graphics Modding

The primary goal for RimWorld advanced graphics modding is Texture Mipmap Control. By default, Unity (RimWorld’s engine) tends to aggressively downsample textures to save memory, which causes the “blurry pawn” syndrome. This configuration focuses on maximizing VRAM usage for textures and adjusting the uiScale for 4K/Ultrawide setups.

File Location

The Prefs.xml is located in your system’s local configuration folder, not the game install directory. Close RimWorld before editing:

%AppData%\LocalLow\Ludeon Studios\RimWorld by Ludeon Studios\Config\Prefs.xml

Technical Configuration (The 2026 “HD-Optimized” Template)

Open the file with Notepad++. Search for these specific tags and update their values as follows:

<?xml version="1.0" encoding="utf-8"?>
<Prefs>
    <uiScale>1.25</uiScale> <customCursorEnabled>false</customCursorEnabled> <hatsOnlyOnMap>false</hatsOnlyOnMap>
    <showRealtimeClock>true</showRealtimeClock>
    <resourceReadoutCategorized>true</resourceReadoutCategorized>
    <runInBackground>true</runInBackground>
    </Prefs>

Parameter Breakdown:

• uiScale: At 4K, the default 1.0 makes menus impossible to read. Setting this to 1.5 ensures your mod menus and work priority tabs are legible. Pro Tip: If you set this too high and can’t reach the “Options” button to fix it, change this value back to 1.0 in the XML to reset.
• runInBackground: Essential for modders who Alt-Tab frequently to check logs or edit XMLs. Set this to true to prevent the game from freezing when not in focus.
• customCursorEnabled: Some high-res texture mods conflict with the Unity custom cursor, causing “ghosting.” Setting this to false forces the native OS cursor, which is more responsive at high refresh rates.

Strategy for 2026 Graphics Performance

Beyond the Prefs.xml, heavy modding requires a specific setup to avoid the “Late-Game Slideshow”:

• The “Graphics Settings+” Synergy: In 2026, the Graphics Settings+ mod is mandatory for advanced visuals. It allows you to override the Mipmap Bias. In the mod’s settings menu, set the bias to -1 or -2. This forces the game to use the highest-resolution version of a texture even when zoomed out.
• DDS Texture Conversion: Never use .png for large 4K texture packs. Use RimPy or RimSort to convert your textures to .dds (BC7 format). The 1.5+ engine reads these natively from VRAM, reducing your RAM usage by up to 70%.
• Pawn Rendering Multithreading: In version 1.6, pawn drawing is offloaded from the main simulation thread. If you use high-detail hair or apparel mods, ensure you aren’t using outdated “Animation” mods that force the game back into a single-threaded legacy mode.
• Shadows Off: For the best visibility of high-res mods, disable “Plant Shadows” in the in-game options. It reduces visual noise and clarifies the “hitboxes” of your beautifully modded structures.

Key Performance Parameters

Parameter	Recommended Value	Impact
uiScale	1.2 – 1.5	Fixes readability on 1440p/4K monitors.
Texture Compression	Off (in Mod Settings)	Prevents artifacts on high-detail textures.
Mipmap Bias	-1.0	Keeps textures sharp when zooming in/out.
VRAM Tracking	Enabled	Helps identify which mod is hogging GPU memory.

Frequently Asked Questions (FAQ)

Conclusion and Expected Results

By precisely tuning your uiScale and combining it with DDS texture conversion, you are optimizing RimWorld for the high-fidelity era of 2026. You can expect perfectly crisp pawn textures, a readable interface at any resolution, and significantly faster load times for your heavily modded colony.