Why does Battlefield 2042 drop from 70 to 30 FPS during urban fights?

I was devastated when massive explosions in urban combat caused my frames to plummet from 70 to 30, completely killing the immersion. I tried enabling 'Prefer Maximum Performance' in the driver panel, but while average FPS rose by 5, the 1% lows remained unstable and jittery. I then used the GamePP Resource Scheduler to set the game process priority from Normal to Realtime and forced the VRAM bandwidth priority strategy. RTSS monitoring confirmed frame generation time converged from 12-35ms to 8-14ms, with GPU temps at 65-71℃ per GPU-Z and VRAM usage at 6.2-7.8 GB per AIDA64.