You can optimize lighting performance with Lumen in UE5 by:
- Lowering Screen Traces in your Post Process Volume.
- Using Software Ray Tracing instead of Hardware if your hardware struggles.
- Setting Global Illumination and Reflection Quality to Medium or Low.
- Reducing Indirect Lighting Intensity on unnecessary Light Actors.
- Enabling Distance Field Shadows for large open environments instead of fully dynamic shadows.
Additionally, use Stat GPU to check what’s consuming the most performance and tweak accordingly.