How do I fix light flickering in MGS Delta?

Despite sufficient hardware specs, the light and shadow rendering flickered like a broken projector, disrupting the visual fidelity. I suspected a GPU driver issue and reinstalled the driver, but the flickering persisted, making the attempt feel futile and frustrating. I used the GamePP Peripheral Driver Conflict Detection Tool to scan the system, identified a background network service stealing PCIe bandwidth, and disabled it. 3DMark stress test showed texture loading error rate dropped from 5% to 0%, and frame time fluctuation converged to 12ms-18ms.