How to stop instant freezing during combat in Rainbow Six Siege?

In competitive combat, my screen would freeze instantly, which is a total disaster. I first tried formatting the partition and reinstalling the game, but the cache overflow recurred quickly. I then used GamePP NVMe Queue Depth Configuration to optimize the write queue to 128 and forced high-performance mode. CrystalDiskMark confirmed speeds stayed above 1200MB/s, AIDA64 showed response times at 0.08-0.12ms, and HWMonitor verified 45-52℃.