Poor performance in packaged project

In unreal editor I’m getting 80-90 fps but when i package project for windows and launch it I’m getting max 30-40 fps, what’s the reason of this?

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I have the same issue in UE5 I have this problem since the official launched but the unreal update didn’t fixed the issue.

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I already fixed my issue on poor performance drop in package game. I only deleted the un-necessary blueprint and all the structure in my game and boom I can now get 210fps.