LTT Forum! Long time watcher of the show and first time coming here as my last attempt to solve this before I go nutso...
So, I've been having quite the odd problem lately - lag due to mouse movement. NOT WEIRD, YOU MIGHT SAY! Thing is, I've updated drivers on every USB port, disabled (then re-enabled) a couple of NVIDIA sound items, moved from windows 10 v1803 to v1903, etc etc etc. Troubleshooted with a friend and he hit me with this: try a different mouse.
So I swap from the Corsair M65 to the less rainbow-unicorn Logitech M510 (cheapo wireless mouse) and the lag goes away. Great, seems like a mouse problem. Well in an unrelated event, I had actually just ordered a Rosewill M59 for my ladyfriend's new build, decided to commandeer that until I could get things sorted out with Corsair on the M65's warranty. Plug it in, BAM - same issue. Swap back to logitech, issue gone. I'm truly stumped, and I'd like to know if anyone has a hot take on this, or even some last-ditch stuff for me to try... System specs below:
i7-6850k (3.6 ghz)
ROG STRIX 1080TI
32gb Trident Z RGB 2400
ROG STRIX X99 GAMING mobo
Seasonic 1000w 80+ Platinum