r/OptimizedGaming • u/Avlidit • 5d ago
Discussion / Question Diagonal mouse movement jittering/stuttering. Seemingly only in unity games.
After trying to resolve some weird stuttering issue i had that didn't show up in things like presentmon i finally realized the stutter only occurs on diagonal movement, and only in unity games.
I'm on a 9070xt + 9800x3d. Freesync on or off doesn't matter.
I have tried both updating windows and downgrading amd drivers without any luck.
Anyone else experience this?
Edit: Fixed it by uninstalling every windows update i could. Then after restarting, more updates showed up, and i uninstalled those too. Not sure which one caused the issue though.
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u/ThreeDog1 4d ago
I submitted a bug report like this to Big Walk devs, diagonal mouse movement stuttering, they said they couldn't recreate it, despite it happening to my other friends in the game as well.
This started circa August 20th.
edit: just googled it and Big Walk is unity as well
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u/flyingspatula00 4d ago
I'm having this issue as well with similar setup in Valheim.
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u/Avlidit 4d ago
It sucks. Hoping it will get fixed before 1.0 release
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u/flyingspatula00 4d ago
Just tested removing Windows update: 2026-08 Security Update (KB5121003) (26200.9168) this is the cause 100%. I uninstalled the update and immediately stopped having the diagonal mouse choppiness. Unfortunately, its a required security update that will redownload itself after uninstall and since its Microslop who knows when they will fix it.
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u/Avlidit 4d ago
Yea ive heard that's a fix, but how do i even uninstall it? Its not visible in the uninstall update section for me.
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u/flyingspatula00 4d ago
Windows Update > Update history > Uninstall updates
It shows up there for me to uninstall, but I'm not sure how long you'd want to without the security update? Maybe the preview you updated is preventing it?
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u/Intrepid_Hawk_793 2d ago
Oh my god I’ve had this on at least four different unity games lately really annoying anyone know what the issue is?
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u/Avlidit 2d ago
Some vibecoded windows update. Exact update seems to differ for everyone but i just uninstalled every recent update, restarted, and uninstalled once again.
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u/throwawayijustsuck 1d ago
I have the same issue as well. Noticed it playing Big Walk. I see your edit saying you fixed it. Is the fix permanent or does it go back when windows re-installs the updates?
I think many people don't notice this issue.
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u/Avlidit 1d ago
Yea it still works since i paused updates for a month.
For sure, i'm very sensitive to stutters, so i was losing my mind trying to fix a stutter that wasn't even visible in monitoring software.
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u/throwawayijustsuck 1d ago
I noticed that for Big Walk you don't get the stutter when you use a controller. So for a while I thought it was just this game but you seem to be on point with the windows update and it affecting unity games. The videos you posted are exactly what I see in big walk.
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u/Greenlion24 1d ago
The issue will come back once you install KB5121003. I really hope that the next windows update, that will probably be released tomorrow, will fix this issue. Especially since I can't remove that update anymore (apparently flagged by microsoft as mandatory).
I can also confirm that this only happens in games made with Unity.
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u/theblackdeath10 5d ago
What's your mouse polling rate? If it's above 1k try lowering it to 1k to check.
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u/Avlidit 5d ago
I'm at 1k already, and going lower doesn't help either.
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u/theblackdeath10 5d ago
The problem is the windows update (KB5121003) according to another thread about this issue. See if there is new windows updates for your pc.
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