P: Slow Curves Adjustment layer with zoom tool selected

Dear @J453 , unfortunately I must redraw my "Correct Answer" (can this somehow be done?) - Meanwhile, I can report, that this slowness and jerkyness is somehow random, also kinda all adjustment layers are affected, not only curves as initially reported.

I could't find a pattern when it's occuring and when not, the multiple workarounds I tried yet, also all the suggested ones, turned out to randomly work - or not.

As already mentioned, on my old MBP13, Early 2015, Intel Graphics only, running still macOS Catalina, the same file causes no problems utilizing the adjustment layers.

Happy debugging 😉

Investigating. Please hit the UpVote if you're affected by this issue.

@Roland_Rick Thanks. I have seen times in the past 20 years where the histogram would cause a severe slowdown like you are seeing, but I don't think it's the primary culprit in your case. That said, the histogram does take some resources to update when you're editing when it's visible - so there's always a slight performance hit with it shown. (e.g. it's not free in terms of processing to use)

I think I have a good enough repro case for our engineers to try and track it down. I think it has more to do with what tool is selected in the Tool Bar  and what zoom level you're at when you're editing the curve.

@J453 , hey man, thanks, removing the histogram was a good idea. Helped.

However: since the histogram is one of the most important things up there and I won't miss it, please forgive me not marking this as solution, because it's only a workarond, sacrificing the histogram.

FYC: I found an old MBP13, early 2015, running macOS Catalina, Intel blablabal graphics only, updated everything Adobe related and it was smoother as on my MBP 16, i9, 2019, Radeon 5500 Pro, 8 GB. Probably those performance issues are caused in relation to the macOS version.

I tested 23.0.2 now.

Looks like "deactivate native canvas" helps a little (can't compare to 21.x which was working perfectly because 21.x is no longer available), I tried restarting PS few times with enabling/disabling it and it works little smoother when it is deactivated.

Easy steps:

1) open image 4016x6016 RGB 16-bit

2) open single curves layer and move points - they move smoothly

3) zoom in very very little

4) open same curves and move - they are jerky

5) ctrl-0 (no zoom)

6) curve points are smooth again

7) zoom out a lot (1/3 image on the screen)

😎 curve points are jerky again

rulers are disabled (tried to switch them with ctrl+R)

Thanks!

One another thing on my end regarding @J453 's Histogram comment.

The histogram panel was never shown on my workspace while I was experiencing the slow curves.

And one another thing: I almost always have super slow curves when the file gets bigger. Same as in the first example video in the thread. But when adjusting the contrast of a mask with a curve it is very clearly slow even with smaller files.

@J453if you want system info here is mine https://community.adobe.com/t5/photoshop-ecosystem-discussions/photoshop-23-x-broken-just-like-22-x-gpu-performance/m-p/12500317

I see exactly same issue but not since 23.x - I see it since 22.x and I was reporting it for about a year here. The last working version was 21.x. Currently thanks to Adobe it is no longer possible to install 21.x so the only solution I found is to restart Photoshop everytime it happens.

The biggest thing that makes a difference is if the Zoom tool is selected. Histogram doesn't make a difference for me.

QQ - if you hide the Histogram panel does the problem go away?