Cities Skylines: Best options.xml for Modded 4K Assets

While the options.xml stores your resolution and basic quality flags, the “Master Config” for a 2026 modded setup relies on the Loading Screen Mod (LSM) and ULOD (Ultimate Level of Detail) overrides. These tools allow you to bypass the engine’s default texture limits, which otherwise “crush” 4K assets into blurry messes to save memory.

File Path

The options.xml is located in the local AppData folder. If you are moving to a new 4K monitor, editing this file manually is often the only way to force the game into the correct refresh rate without crashing on launch.

%LOCALAPPDATA%\Colossal Order\Cities_Skylines\options.xml

Technical Note: In 2026, ensure your maxFrameLatency is set to 3 in the XML. This creates a small CPU buffer that smooths out the micro-stuttering caused by heavy 4K asset draw calls.

Optimized 4K Rendering Configuration Block

Locate these keys in your options.xml and adjust the values. These settings are tuned for high-VRAM GPUs (12GB+) handling custom 4K buildings.

Parameter	Recommended Value	Technical Purpose
m_textureQuality	0	Forces highest resolution textures (0 = High/Original).
m_shadowQuality	2	Sets shadows to “High” to avoid the pixelated edge look on 4K assets.
m_lodLimit	1.0	Keeps the base LOD transition standard; use ULOD mod for further scaling.
m_maxFrameLatency	3	Smoothes out stuttering when panning over high-density 4K districts.
m_anisoLevel	16	Ensures 4K road textures stay sharp at extreme camera angles.

<GraphicsQuality>
    <m_textureQuality>0</m_textureQuality>
    <m_shadowQuality>2</m_shadowQuality>
    <m_lodLimit>1.0</m_lodLimit>
    <m_anisoLevel>16</m_anisoLevel>
    <m_aaLevel>2</m_aaLevel> <m_maxFrameLatency>3</m_maxFrameLatency>
</GraphicsQuality>

HowTo: Engineering a Stable 4K Modded Experience

To achieve true 4K fidelity on GameEngineer.net, you must supplement the options.xml with these essential mods:

1. Loading Screen Mod (Revisited): This is mandatory for 4K assets. Enable “Share textures” and “Share materials” in its options. This allows the game to load a 4K texture once and apply it to multiple buildings, saving gigabytes of VRAM.
2. Dynamic Resolution: Set this to 200% if playing on a 1080p screen, or 100% (Native) on 4K. It replaces the game’s poor internal AA with a much cleaner downsampling method that makes 4K assets “pop.”
3. Ultimate Level of Detail (ULOD): Set your Building LOD Distance to at least 1000m. This prevents 4K buildings from switching to their ugly “low-poly” versions too early.
4. Shadow Distance: In the options.xml, shadow distance is capped. Use the Render It! mod to push shadow distance to 4000m+. This is essential for 4K visuals as it prevents the “vanishing shadow” effect on distant skyscrapers.
5. Virtual Memory (Pagefile): If you have 32GB of RAM and hundreds of 4K assets, your game will still crash. Manually set your Windows Pagefile to 40GB+ on your fastest NVMe SSD to handle the asset overflow.

Technical Explanation: Draw Calls and VRAM Paging

When you load a 4K asset in Cities: Skylines, the Unity engine generates a Draw Call for every material used. In 2026, modders often create assets with “Sub-meshes.” Without the options.xml set to m_maxFrameLatency=3, your CPU will attempt to send these thousands of draw calls instantly, causing the game to “hitch.”

By forcing the engine to use high-fidelity textures but keeping Foliage Quality at Medium in the XML, you save precious draw calls. Foliage is the #1 killer of FPS in modded cities because every tree is a unique object. Restricting foliage while maximizing building texture quality ensures the GPU focuses its power on the 4K geometry that actually defines your city’s skyline.