How do I manage lighting and performance balance in large open-world level design?

Legacy UDK Content Creation and Design
1

I’m prototyping a large outdoor level and have trouble balancing dynamic lighting (for time-of-day changes) with performance. Using too many movable lights tanks my frame rate, but I also want realistic shadows and day/night transitions. Are there any beginner-friendly approaches to setting up scalable lighting for open-world scenes?

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UDK or UE4/5?

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