How to fix the mushy input lag on MSI B450M MORTAR MAX?
My blocks were lagging by about 80ms on screen, and that mushy feeling is a total disaster when you're facing high-difficulty bosses. It turns out some of the USB 3.1 ports on the MSI B450M MORTAR MAX were fighting for IRQ resources during high-frequency input, causing latency spikes between 15ms and 45ms. I tried swapping out my peripherals for different brands, but the lag followed me, making me realize this was a motherboard-level issue. I went into the BIOS, forced the USB mode to Gen2 instead of Auto, and disabled USB selective suspend in Device Manager. Using a latency tester, my response time plummeted from 32ms to a crisp 8-12ms. I had a brief moment of panic when my mouse disconnected after the first tweak, but updating the chipset drivers sorted it out. Southbridge temps sat around 48-54℃. After three brutal boss fights, the input is finally responsive and feels instant.
