A predictable setup is easier to maintain than a heavily customised one. Use this workflow when launch or performance behaviour changes.
When stability changes, first verify that you are running the current published build. Use the download page and changelog rather than mixing files from older packages. A clean, current installation is the easiest baseline for any troubleshooting session.
Configuration changes can look like performance problems. Restore a profile you know worked, then test the application before adding new settings. After that, change one category at a time: display settings, aim settings, world visuals, radar, and other optional features.
This workflow also makes it easier to separate a configuration problem from a broader Windows or Fortnite compatibility issue.
Windows updates can affect permissions, application behaviour and the surrounding environment. Fortnite updates can also change compatibility. After a major update, check the status and updates guide before changing several variables at once.
Close unnecessary overlays and background applications while testing. If the problem disappears in a clean environment, re-enable components one at a time. Record what changed so you can reproduce the problem before contacting support.
For a clean test, use the current Blurred build, a known-good profile, the current Fortnite version, and as few unrelated overlays as possible. Record any change you make and test it before adding another variable. This is slower than changing everything at once, but it gives you a result you can actually diagnose.