Change options settings: Options -> Graphics -> Shadow Quality.
Controls both the method and quality of shadows. Decreasing this may greatly improve performance.
| Name | Description | 
|---|---|
| Low | Low-resoultion terrain shadows, blob shadows for units. | 
| Medium | Low-resolution terrain shadows, high-resolution dynamic shadows near player. | 
| High | High-resolution dynamic shadows for entire scene. | 
| Highest | High-resolution, highest quality dynamic shadows for entire scene. | 

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