I have a scene I’ve been working on to teach myself how to use UE5. One issue I’ve had since the beginning is that the entire scene is lit by dynamic emissive materials. The player walks through a dark crystalline cavern and emissive materials brighten as the player approaches.
The materials themselves emit light as expected, but the bounce lighting takes ages to update (okay, like 10 seconds or so, but it’s way too long). I’m sure this is a performance saving feature baked into UE5, but it totally ruins this particular scene because of the way it is lit.
After a bit, this is what it will eventually look like, which is the desired result
I have combed through forums, videos, and in-engine settings. I have experimented with every checkbox and slider I can find. This is driving me crazy.
It’s also an issue because the color of my lights change, not just the intensity. They start out pink and turn blue as the player nears.
Here’s a shot of this crystal when you first approach
And then a shot after waiting 10+ seconds
The objects are set to static. They have emissive light source checked. I’ve tried world settings with lumen and ray tracing. I’ve tried it with and without manual exposure.
I’ve thought about faking it with light sources, but the engine is clearly capable of what I want. I just don’t know how to make it update faster. With that said, I’ve self-taught and only used the program for a handful of months, so please feel free to be redundant as I could easily have missed something obvious to anyone that actually knows what they’re doing 
Thanks in advance for any help. Cheers! <3