Question Good setup, but bad FPS? [Please help]

Are you using something like MSI Afterburner for those usage figures while gaming?

The Userbenchmark link already notes something about their test of your system: high CPU usage. What software or processes are you running in the background? Personally would suggest a virus and malware scan to eliminate those as possibilities to be on the safe side.
 
A lot of Intel users have CPU lag in fortnite. Someone mentioned that setting the frames in game from unlimited to 60 helped a lot.
The problems apparently started with some season update from fortnite.