How to fix interface interrupt latency on Biostar A320MH PRO?
Every time I hit the attack button, there's this tiny, perceptible hitch in the frame. In a fast-paced action game where timing is everything, this kind of input lag is an absolute nightmare and had me feeling seriously anxious. I ran LatencyMon and found the USB controller on the Biostar A320MH PRO was spiking DPC latency up to 2.9ms, which was causing the frame time to jump all over the place. My first instinct was to swap from a USB 3.0 to a 2.0 port; it lowered the latency slightly, but it capped my controller polling rate at 125Hz, which is a total dealbreaker for competitive play. I eventually went into Device Manager and disabled three redundant USB ports I wasn't using, then used a tool to manually reassign the IRQ interrupts for the NIC and GPU. After that, LatencyMon showed DPC latency pinned below 0.6ms, and that floaty input feeling completely vanished. I did have a scare where I accidentally messed up the audio driver config and lost all sound, but a quick service restart fixed it. Chipset temps are 40-48℃ and RAM is 36-40℃. Tested with an input lag tool and it's finally back to normal.
