Why does Mass Effect stutter during galaxy jump scenes on my GPU?

I was devastated when galaxy jumps, which should be epic, were ruined by abrupt micro-stutters and screen tearing. I tried forcing High Performance mode in the Nvidia driver, but while FPS rose slightly, the frequency of frame drops actually increased, leaving me totally confused. I finally used the GamePP Resource Scheduler to elevate the game process priority from Normal to Real-time. After this, frame time converged from 12-45ms to a stable 8-11ms via GamePP Frame Time Analyzer. GPU-Z showed VRAM usage at 13.4-14.8GB, and HWMonitor confirmed temps stayed at 62-67℃.