Why is the Jginyue X99 TITANIUM D4 causing input delay during high-speed driving in Pacific Drive?

When pulling a high-speed turn, the steering wheel feedback felt a fraction of a second late. In a sim-driver, that's basically fatal. Testing showed that the Jginyue X99 TITANIUM D4 USB ports were dropping from 1000Hz to 500Hz when the CPU was pinned, causing latency to swing between 7-14ms. I tried switching between USB 2.0 and 3.0 ports, but the jitter was everywhere, which made me really paranoid about the board's quality. I went into the BIOS, forced the USB mode to 'Enabled', and killed all the power-saving options for the hubs. Using a latency tool, the response time tightened from a shaky 9-17ms to a rock-solid 2-4ms. Some of my legacy USB gear stopped working initially, but setting those specific ports to Compatibility Mode brought them back. Chipset temps are around 58-64℃. Verified the final response parameters with a dedicated lag tester.