I feel like there's 1000 of these threads, but I couldn't find one that was close enough to my problem and didn't want to necro any old posts.
Ever since the large-ish update a few weeks ago (April update with the MM changes and all that), I've had some pretty annoying mouse input lag. It's not enough to be a HUGE unplayable issue, but it's bad enough where it seriously bothers me and alters my aim quite a bit. Yes V-sync and Mouse Accel are off, I've done mark c mouse fix, re-installed about 8 times, turned off the controller settings (as far as I know), used different configs, different direct x levels and all that. It ONLY happens in TF2 and is perfectly fine in all other games as well as on my desktop. It very slightly gets worse over time, but theres no overheating happening. I've had a few times where it fixed after a clean re-install but it seemed to go back to being laggy after a little while. My framerates are almost always 200+ even in pubs, so that's not the problem either. I've had the issue in the past but it used to go away after a few months, this time it has not.
Thanks in advance for any help!
edit: I forgot to mention that my brother also plays TF2 on my PC (different windows account) and I'm curious even if the settings are the same across the accounts (minus like crosshairs and sensitivities etc) that logging into my account after he was logged into his could affect it in any way?
edit: Also decided to check CSGO since I haven't and the issue seems to be there as well. The only things I can think of would be: A source engine issue or a resolution issue (I play at stretched 1024x768 on both games)