How can I stop frame rate drops in multiplayer combat?

Aiming was impossible as the Vastarmor Radeon RX 9060 XT 8GB OC Black Alloy dropped from 144 to 72 FPS. I lowered shadows, but the detail loss was unacceptable. I used the GamePP Resource Scheduler to set priority to Real-time and excluded antivirus. RTSS monitoring showed intervals converged from 6-12ms to 4-5ms, with bandwidth stable at 85-92%. This set the stage for smooth combat.