Why does Fortnite stutter on AMD Ryzen 9 9950X3D and how do I fix it?

I was losing clutch fights because my character's turn rate lagged, with RTSS showing frame times spiking from 8.2ms to 15.4ms. I tried setting the process to 'Highest' priority in Task Manager, but the system felt sluggish and unresponsive. Then, I used the GamePP Resource Scheduler to set the game to 'Real-time' priority and enabled the High Performance power plan. AIDA64 confirmed the CPU stabilized at 5.6GHz, and RTSS showed frame times dropping to a smooth 8.5ms, with temperatures holding at 78-82℃. This setup is essential to save your competitive edge.