Problems with gaming, despite a good PC?

Ryzen 7 3700X, RTX 2080 Super, 16 GB RAM, MSI B450 TOMAHAWK

And I have the problem in Fortnite that the game keeps getting stuttering FPS and still images. Otherwise all games work smoothly for me. Can someone help me? I have no idea, but I was recommended to watch the values while playing.

Internet connection?

I think that can also be the Fortnite server because they are currently unstable

It's up to me with Fortnite at the moment so don't worry about your PC

So if it is only with Fortnite my prediction is correct, if it is also for other games I would see if the power supply has enough power because it could be that if the CPU boosts the graphics card there's no power

Use the following power supply: 650 Watt Seasonic Focus GX 80 Plus Gold power supply, modular
so I don't think I'm underpowered.

Yes it is due to the servers

What kind of ping you have

I guess about 20-30ms

You sure have a better one than I do.

Could it be that you are really bad in Germany and an internet? Sue the federal government. I live in Denmark Every village has glass fiber there

Do you stream or why do you have so many cores

No i don't stream xD