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Map Check Error - Large actor receives a pre-shadow

I am getting a performance hit when trying to play so I did a map check and received these errors:

Performance Warning InstancedFoliageActor_0 Large actor receives a pre-shadow and will cause an extreme performance hit unless bCastDynamicShadow is set to false.

How do I fix this?

This answer might help:
Large actor receives a pre-shadow and will cause an extreme performance hit - UE4 AnswerHub

Then again, maybe not.

I’m seeing the same warning and like you, the actor causing the issue is foliage.

You will indeed get that error using foliage. Make the foliage groups smaller, or just turn off shadow casting on foliage. I did that and my FPS indeed went up quite a bit.

Old topic once again, but thank you for your help. I was able to disable shadow casts for my insane amount of foliage, and repro similar shadow using my skylight and another light source closer to my grass.