Lumen improvements in Unreal 5.1 include:
- Improved performance optimizations in High scalability mode with the goal of achieving 60 fps on consoles
- Improved support for foliage
- Reflections on Single Layer Water
- Support for high-quality mirror reflections on translucent surfaces
- Support for nDisplay (SWRT and HWRT)
- Initial support for split-screen (SWRT only); performance characteristics still TBD
- Experimental: Hardware Ray Tracing (HWRT) in Vulkan - Surface cache lighting only, no support yet for Hit Lighting
- Many stability, quality, and bug fixes