Fortnite laggs with Directx 12?

I've heard that fortnite is now compatible with Directx 12, my problem is only when i do directx12, fortnite keeps putting on, so i have 200 fps and at one time they drop to 7 fps, with Direct 11 i do not have that! But I have the feeling that I get along with directx12 better only these individual drops annoying very dolle! In my setup it is by no means!

Processor: Ryzen 5 3600

-Graka: Amd Radeon rx 5700xt

Now I would need a solution if you can do something because I would like to play with Directx12!

At DX 12 beta is tuned - just tried it just for fun.

Game Crashed constantly. No Joke GTX 2080 ti i9-9900k…