My Noctua NH-D15 G2 seems to struggle during late-game turn calculations in Civ 7. How do I stop the lag?

During massive turn calculations, I'd get these tiny hitches that are incredibly noticeable in a strategy game. The default fan curve on the Noctua NH-D15 G2 was just too slow to react to the bursts, letting the core drift between 82-88°C and triggering slight clock dips. I tried lowering the graphics, but since the lag happened during calculations, it did nothing—it was a pure thermal efficiency issue. I ended up re-checking the mounting pressure of the base and bumped the 75°C fan speed to 1300 RPM. RivaTuner showed my frame time variance shrink from a wild 16-45ms down to a stable 12-18ms. I actually messed up the first reinstall and accidentally bumped the RAM heatsinks, but a quick reposition fixed it. Now the CPU is rock steady at 65-72°C. After three hours of gameplay, the stutters are gone, and memory temps are holding at 58-63°C.