Why does Starfield freeze for 2 seconds when landing on planets?

I was totally immersed in Starfield until every planet landing triggered a jarring 2-second system freeze. I first tried disabling all unnecessary startup items in Windows; while boot speed improved, the transition freezes persisted, proving that basic cleanup wouldn't touch the core I/O issue. I then used the GamePP Resource Scheduler to monitor I/O wait times. After a failed attempt at 'Real-time' priority that caused mouse stuttering, I set the priority to 'High' and limited antivirus usage. RTSS monitoring showed frame times converged from 20-60ms to 14-22ms, while HWMonitor confirmed CPU temps stayed at 65-72℃, and AIDA64 measured I/O wait at 120-180ms.