The likely refers to the major technical overhaul introduced in Fortnite Chapter 6, Season 3 , specifically the launch of the DirectX 12 Performance Mode setting . Key Technical Improvements
: A separate "Season 3" era patch for The Witcher 3 also introduced a performance mode specifically for Ray-Traced Global Illumination on PC to prioritize frame rate. Fortnite's NEW Performance Mode – Huge FPS Boost! Next Performance Mode Update in Season 3! (Perf...
: Players may experience temporary lag or hitching during their first few matches as the game compiles shaders for new map areas. The likely refers to the major technical overhaul
: Unlike the classic DirectX 11 mode, which is largely single-threaded, the new DirectX 12 performance mode distributes the workload across multiple CPU cores. which is largely single-threaded