Why does Horizon: Online stutter in player-dense social hubs?

I felt totally defeated when entering player-dense hubs; the screen tearing and choppy controls completely killed the immersion. I tried lowering shadow quality in the game settings, but my frame rates barely budged, leaving me frustrated. Then I used the GamePP Resource Scheduler to elevate the game's main process priority from Normal to Real-time and capped background browser RAM. It worked! Bandwidth utilization stabilized at 82-86% per GPU-Z, memory latency hit 72-88ns via AIDA64, and temps stayed at 52-58℃ per HWiNFO.