Why does my Sapphire Pure Polar RX 9070 XT hit VRAM scheduling delays and drop frames in cities?

Running through crowded city streets felt like a slideshow, with these micro-stutters becoming a total disaster at 4K. Even though the Pure Polar has beastly cooling, the default GDDR6 frequency curve creates a nasty 14-22ms scheduling lag when loading massive NPC models. I tried enabling Low Latency mode in the drivers, but while the input felt slightly snappier, the frame drops didn't budge, which was honestly baffling. I ended up using an overclocking tool to lock the memory clock into a non-symmetric range of 2400MHz - 2600MHz and bumped the core voltage to 1.06V. Checking HWInfo, the VRAM voltage swing tightened from a wild 0.16V jump down to a steady 0.04V, and the stuttering vanished. My first attempt at cranking the frequency actually crashed the game to desktop, and it only stabilized after I recalibrated the voltage offset. Core temps sat at 62-67℃ and VRAM stayed between 75-81℃. Stress tests confirm the scheduling lag is gone, though the high VRAM temps are a bit concerning.