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Hi, I haven't been reporting this bug before because I haven't been updating regularly (I was on Photoshop 24.0 for a while) but now i'm on Photoshop 24.6 and I can say that this bug still remains : if you rotate the canvas (R on the keyboard) and you start to draw, there's no problem BUT if (still in the rotated canvas) you cancel the last stroke (Ctrl+Z) and start drawing again (still on the rotated canvas), you can experience a bug where the stroke doesn't appear immediatly. There's like a buffering, like there is a huge lag between you drawing a stroke and the stroke appearing on the canvas. Not sure why. I'm curious if others had the same experience.
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Can you Record what you see? I couldn't reproduce it. I don't know if it's not reproducible or if I'm missing what you're going through.
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@JqqerryI'll try to, i'm not sure how to do it.
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@Jqqerry
Ok so i'm not sure if it's really helpful because I haven't recorded the series of events that led to this but here is the brush lagging like hell when on a rotated canvas :
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Let's make sure we're in a default state and there are no stale settings somewhere:
Restore your preferences using this manual method:
https://helpx.adobe.com/photoshop/using/preferences.html#Manually 
Does it work correctly?
If that doesn't solve it, you can quit Photoshop and put the Settings folder back.
It may help if we could see your Photoshop System Info. Launch Photoshop, and select Help >System Info...and copy/paste the text in a reply.
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Is there a step I missed in what you told me? @jeromea13244388
https://youtu.be/nu7tikEld7I
I tried to reproduce it for about a minute, but it doesn't seem to be reproducing. I tried to activate it because I thought it might be a problem with Shape Dynamic, but I don't think it's...
I don't think you'd make that mistake because you know Photoshop as well as I do, but what's your smoothing rate?
It's not a smoothing error, is it?
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@JqqerryI try to make it happen and it seems difficult, sometimes it works, sometimes it doesn't, it's not automatic.
Here's a series of events that resulted in the bug but I did it again afterwards and haven't managed to reproduce the bug :
>create new layer
>rotate canvas
>draw on the new layer several strokes so you have 10+ new history states
>in the history menu, go back on the "new layer" state
>now you should register a big lag when trying to draw again
Maybe it happens after you work on your drawing for a while... It seems to have something to do with the cache ?
Maybe the fact to draw with a quite 100%+ zoom is a factor.
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@JqqerryThe problem is not due to smoothing... Again it's a bug that happens only when the canvas is rotated, I don't have this lag otherwise. But it's not like you rotate the canvas and all of a sudden you dan't draw, it seems to be after a while... Maybe my cache settings are a bit peculiar, I've cache levels:8 and cache tile size:1024.
I appreciate your effort but I recognize it's tricky, I don't manage to understand what's the cause, it doesn't happen automatically. Maybe you'll see it someday 🙂