Disabling anti-aliasing in Fortnite's visual settings can make it easier to spot enemies hiding in bushes.
As Fortnite players scramble for whatever competitive advantages they can find, many are realizing they can disable anti-aliasing to see a small white indicator on bushes that have enemy players hidden inside. This allows them to fire with accuracy on enemies they can't see.
Anti-aliasing is a purely visual effect that smooths out the edges of objects, having no other effect on gameplay.
As is often the case in competitive video games, serious players drop Fortnite's settings as low as they'll go to wrest as much performance as they can from the game. Anti-aliasing is particularly strenuous, making disabling it also useful from a performance perspective.