There are a few other options you can try but they didn’t seem to have much of an impact in terms of FPS. Paste in the settings from above remembering to use your own value for logical processors.Scroll down until you see manage games, click Fortnite.Click the cog icon labelled ‘Settings’ in the bottom left.In the bottom right you will see ‘Logical Processors’.The value for –PREFERREDPROCESSOR is 4 for me but it may be different for you depending on your machine. USEALLAVAILABLECORES –PREFERREDPROCESSOR 4

We need to add the following to our Epic Games Launcher launch options for Fortnite:

First, we will change our launch options before getting into any of the individual game settings.