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Cities: Skylines 2 Performance Optimization
Fix lag, stuttering, and low FPS — especially in large cities.
Updated: May 2026
Instant Answer
Why Does CS2 Run So Badly?
CS2 is CPU-heavy and poorly optimised at launch. The biggest gains come from lowering simulation-heavy settings (Level of Detail, shadows, volumetric clouds) and designing cities that reduce pathfinding load.
01 Graphics Settings That Matter Most
- Level of Detail: Medium saves significant CPU cycles
- Shadows: Medium or Low — biggest visual-to-performance trade
- Volumetric Clouds: Off or Low — expensive for minimal visual gain
- Depth of Field: Off — saves GPU with no gameplay impact
- Global Illumination: Low — very expensive on GPU
02 Resolution and Scaling
If GPU-limited, drop resolution scale to 85-90% with FSR or DLSS enabled. The visual difference is minimal but the FPS gain is 20-30%.
03 City Design for Performance
Fewer intersections and simpler road networks reduce pathfinding calculations — the biggest CPU bottleneck. Compact city designs with efficient transit run faster than sprawling grids.
04 Mod Management
Every mod adds load time and memory usage. Disable mods you’re not actively using. Map mods and custom asset packs are the heaviest — use sparingly in large cities.
05 Hardware Recommendations
CS2 benefits most from fast single-core CPU performance and 32GB RAM. GPU matters less than CPU for large cities. An SSD is mandatory — loading from HDD creates constant stuttering.