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Frame Leaf Event, please help!

Can someone please explain what is that "Frame Leaf Event" (and slateUI). My FPS is sky rocketing sometimes to the point where it is completely freeze screen. In those situation when I check GPU Visualizer, "Frame Leaf Event" is taking the whole process or most of it.

I noticed it happened in different scenes I was working on, but this particular one I am working on right now has baked lights and everything is working okay, then suddenly FPS goes to crazy numbers.

I am sending you screenshots of the GPU visualizer

Please help me, I am not sure what I am doing wrong and this is so frustrating..

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Product Version: UE 4.18
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asked May 11 '18 at 08:52 AM in Using UE4

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