I am seeing a noticeably higher RenderDeferredLighting cost switching from 4.24 to 4.25 of around 1.9 ms on 4.24 up to 4 ms on 4.25. I have tested a couple frames in my level to make sure and it appears to be consistent and results in a roughly 18% performance hit in my level.
Additionally deleting my sky light, my skysphere and my directional light does not reduce the cost, however disabling deferred lighting through the flags does reduce the cost down to 0. Starting with an empty level incurs 0 deferred lighting time, however starting with the default level and deleting everything still results in <0 deferred lighting time.
To conclude I’m very confused, and would appreciate some guidance on this one.