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Local lights can enhance realism and atmosphere, but they can also significantly impact performance — especially when shadows are enabled.
Try HDRI adjustments first – if a scene lacks lighting, start by trying different HDRI environments. And make sure to fine-tune HDRI parameters for optimal lighting results. Note that Environment Intensity can be set above 100% by manually entering the value.
Be mindful with shadows – by default, local lights have shadows disabled. Enable them only when necessary, and only on the specific lights where shadows add a clear visual benefit.
Prefer directional or spotlight sources – these light types are generally more efficient in terms of shadow rendering and performance.
Limit shadow-heavy light types – avoid using more than one Point or Rectangle light with shadows enabled in a scene. These types of lights are more taxing on performance.
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