How to fix 0.3s freezes during fast building in Fortnite final circles?

In the final circle, my screen would suddenly freeze for 0.3 seconds, which is an absolute nightmare in competitive play. I tried lowering all graphics settings to minimum; average FPS rose, but 1% lows remained unstable per RTSS, proving the bottleneck was scheduling. I used the GamePP Resource Scheduler to set the game process to Realtime priority and forced the VRAM bandwidth priority strategy. RTSS showed frame times stabilized at 11-16ms, with VRAM temperature at 42-48℃ per GamePP and core temps at 55-62℃ via AIDA64.