"PostRenderOpsFX" taking too long?

Hello everyone, I don’t know what’s happening with my project, but after about 30/40 seconds the framerate drops from 70/80 to 20/30. During this interval, I create some actors. It seems there is a bottleneck in this “PostRenderOpsFX” which is taking too long. Furthermore, this tool doesn’t show what’s taking so long to render. What should I do? Should I start removing things and testing to see?

Is it really a GPU bottleneck? Sometimes “Translucency” also appears as taking too long.

Thanks for your time.

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Have you found a solution ?