I'm looking for an FPS Boost program. Especially against FPS drops.
(Intel core i5 8400, geforce gtx 1050, 8 Gb RAM,)
There's no program against this
If you have fps drops despite low load, new hardware / a windoof reset will help
So if this is very important to you then the following measures:
BIOS update
Reinstall Windows
Install chipset driver
Install the graphics card driver
Then reinstall Fortnite and settings to low
Then you can screw up the settings individually and see which setting the fps drops come at. Then back to low