Why does my RTX 5070 Ti drop from 120 to 50 FPS in combat?

Every time a flashy combined skill triggered, the frame rate crashed from 120 to 50, leaving me feeling incredibly anxious. I tried increasing virtual memory to 64GB, but it didn't stop the drops and actually caused occasional system freezes, which was deeply frustrating. I accessed the GamePP DLSS/FSR Image Sampling Calibrator, switched to Balanced mode, and locked the resolution to 90%. This worked perfectly; frame times stabilized at 14-19ms per RTSS, VRAM usage stayed at 11.2-12.8GB per GPU-Z, and clock speeds hit 2500-2700 MHz per HWiNFO.