Epic Games is working with Nintendo to sort out the performance issues for Fortnite on Switch in the next update
Fortnite’s Switch issues have gotten worse over the last few patches and Epic seems to have found the solution.
While Fortnite launched on the Switch at E3 and played mostly great, the last few updates have been making things worse. Epic Games has identified the issue and is working with Nintendo to address the problems in the next update to Fortnite that will be the 5.40 release. More details including a workaround of installing to the SD Card are available here.
Fortnite is now available on iOS, PS4, Xbox One, Android, Nintendo Switch, and PC platforms.