I have something interesting about USB input latency to share. In 2014 I built a new computer with a i5-4590 CPU, ASUS Z97-A motherboard and 8GB of Kingston DD

I have something interesting about USB input latency to share. In 2014 I built a new computer with a i5-4590 CPU, ASUS Z97-A motherboard and 8GB of Kingston DDR3-1866 memory. One thing I instantly noticed was that my mouse (Logitech G400) would feel "delayed" compared to my older computer from 2010 (i3-550, Intel DH55HC motherboard). I could have the same OS (tested Win7 and Ubuntu), GPU and monitor between both computers and switch, and the difference was that obvious. Another problem I had was DPC latency under Windows with driver: "usbport.sys". USB audio would drop out in correlation with DPC latency spikes and I believe it was related to the mouse latency. Under Ubuntu I had the same problem and logged a dmesg message that said "retire_capture_urb: x callbacks suppressed", with the same symptoms. I got so frustrated I stopped using the new desktop and went back to my old desktop and a new laptop for about 2 years, after wasting my time running Prime95, MemTest86 for over 24 hours, and swapping the motherboard with another model that let me disable HPET (Supermicro C7Z87-O) In the end, last year I decided to work on it again and swap the memory with some Corsair 2X4GB DDR3-1333 memory and just like that, the DPC lag spikes were gone, USB audio didn't drop out and my mouse stopped lagging.