I'm getting random speed drops and frame hitches while riding across the open world. Why does this keep happening?

Riding through the English countryside at full speed, I noticed this tiny, rhythmic twitching in the movement. It's subtle, but at 4K, it's incredibly distracting. HWiNFO showed me that the Zhitai TiPro9000 1TB controller was hitting a 75℃ ceiling under sustained load, causing read speeds to swing wildly between 6000 and 2000 MB/s. I tried disabling every useless background service in Windows, but the frame variance didn't budge. Software tweaks are useless against raw heat. I ended up swapping the stock heatsink for an active cooling version and disabled PCIe Link Power Management in the BIOS. Now, the drive stays chilled between 52-58℃, and the read speeds are locked in at 6200-6500 MB/s. The hitching is completely gone. I did run into a snag where the new heatsink was so bulky it raised my adjacent RAM temps by 3℃, but I sorted that out by optimizing the chassis airflow. Idle temps are now 40-45℃, and the controller is a steady 55-60℃.