Why does Forza Horizon 5 stutter in towns with Asgard Snow DDR5?

While speeding across the Mexican plains, I noticed micro-tearing whenever entering complex towns, which totally broke my immersion. I tried enabling V-Sync in game settings, but it didn't stop the stuttering and instead increased input lag to over 25ms per RTSS. To fix this, I used the GamePP Resource Scheduler to set the game priority to Realtime and disabled background services. Now, frame generation time converged to 11-14ms per RTSS, voltage hit 1.38V per HWiNFO, and memory temperature remained stable at 46-53℃ per AIDA64.