Lumen rendering latency / refresh rate in real time ??

Lumen Lighting Update Speed

Lumen uses a number of caches to achieve real-time performance. While local lighting changes propagate quickly, global lighting changes, like disabling the Sun, can take multiple seconds to propagate. Projects can use the Lumen Scene Lighting Update Speed and Final Gather Lighting Update Speed controls in the Post Process Volume to work around this delay at the cost of increased GPU cost.

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