Why does my Cooler Master B240 cause CPU overheating and lag during the building phase in Nightingale?

Whenever I started constructing large bases, the CPU temp would slowly climb past 90℃, leading to these periodic micro-stutters that were incredibly jarring. I listened closely to the B240 pump and noticed the pitch was too low, suggesting the voltage was too low for efficient circulation. I tried cranking up the case fans first, but that only dropped the temp by 2℃ while making the PC sound like a vacuum cleaner—clearly, the problem was the loop itself. I went into the BIOS and forced the pump header to a constant 12V output and used compressed air to blow out the radiator dust. After the reboot, full-load temps stabilized at 68℃ - 75℃ and the stuttering vanished. I was actually terrified of breaking the fan blades while cleaning the rad, so I went slow. Pump speed is now locked at 2800 RPM. Ran a Cinebench loop to make sure I didn't lose any performance, and it's all good.