How to fix USB input delay on ASUS ROG STRIX Z890-A Gaming WiFi S?
Right as I go for a stealth kill, there's this roughly 20ms delay in key response—in a game like this, that's the difference between a clean kill and getting caught. The USB ports on the Z890-A keep dipping into low-power mode by default, causing the polling rate to jump erratically between 500Hz and 1000Hz. I tried swapping between the rear and front panel ports, but the lag persisted, which was honestly pretty stressful. I eventually went into the BIOS Advanced menu, nuked the USB power-saving options, and forced the XHCI mode to High Performance. Using a latency tester, my response time dropped from 18-25ms to a rock-solid 1-2ms. I did have a moment where my mouse stopped being recognized after disabling power save, but a fresh chipset driver install sorted it out. VRM temps are 52-58℃, and the system is stable. Input analysis tools confirm the response is now perfectly synced, with RAM temps at 58-63℃.
