Extremly low FPS while in game

[MajesticKraken]

Hello Kerbonauts,

the problem is, that whenever I start KSP, all is running nicely around 50 fps up until the menu. In the menu all is still good. But then when I start a game, the game drops to under 10 fps. When i quit back to menu, the low fps still persists. I don't know what to do. Is it some of my mods ore something like that? Every other game runs on my pc quite nicely.

PC Specs:
Graphics Card: Sapphire Radeon R7 360 NITRO 2GB DDR5
Processor: AMD FX-4320
RAM: 8GB DDR3

https://imgur.com/a/TcO3fho

Link to imgur with documentation.

Thanks for your help