Why my FPS is going to 5 for no reason

Hello everyone, im here to ask for a help. my UE project is going to 5 fps when i start to play my game, I try to close all programs of my computer, change the setting of my game, turn off the Raytracing, update my Drives, Restart the UE, the project dont have any big collision, just a little floor and the player. Its always the same thing, when I am in the Editor mode the FPS goes to 120, when i start to, but its just whait a few minutes and the FPS goes to 5 or 4…
The “Unit” shows my GPU and its very slow for some reason…
my computer also runs heavier programs with extreme ease, with no FPS drop, so I guess that’s not it too…
can someone help?

It will some code you’ve written.

What is happening in the level?