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Bad Perfomance With Masked Materials

Hi, i made an effect with a sphere mask that covers my entire level and fades in the opacity of the materials as it gets bigger. I want to simply reveal the opacity of objects as i walk around them. The interior of the sphere has 1 opacity and the exterior 0. I came to a point where there is a big performance issue with overdraw in some big levels. Ticking on ''Mask material only in early Z-pass'' gets rid of shader overdraws in Shader Complexity view mode completely, which should be ok, right? But the performance is the same around 65 fps, with opacity full 1 it is around 80. Do i miss something here? Is there another method which doesn't have this kind of impact on fps?

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''Mask material only in early Z-pass'' ticked

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''Mask material only in early Z-pass'' NOT ticked

Product Version: UE 4.20
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asked May 13 '19 at 12:55 PM in Rendering

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