Some developers are finding that the change to add a bunch of shader types to FLandscapeMaterialResource::GetExcludedShaderTypes() in 4.18.2 increased their project cooking times on PC or console by 3 or 4x. My test of the Content Browser Landscapes map showed a 6x difference
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-53904 in the post.