P: Temp Files Filling Scratch Disk FAST (possible memory leak?)

Absolutely. I am happy enough to have a temporary solution for now that you have provided us with. Looking forward to the fix for this issue, cheers.

Noel   That's an excellent explanation and clarification on things moving forward in Photoshop. Thanks so much.

Thanks for letting us know the workaround was effective.  Please rest assured we're working a real fix for the issue.

As far as "if it ain't broken, don't fix it" goes in general...  I'm afraid we can't always comply; there's a real need for us to move our architecture forward.

As an analogy, you may choose keep your car for a long time, put on new tires, maintain parts that wear, even paint it...  Great!  It continues to do what it did.  But now and again you may crave a new model because new ones have an updated engine design under the hood to give you capabilities you did not have before.

In similar fashion, we need to update our underlying compositing engine design in order to be able to deliver new features and take advantage of modern computer hardware, not to mention run on new platforms.  You may not see the advantages of our new compositing engine in obvious ways just yet, but you will.

Thanks again and as always for your understanding and patience - and especially for your help identifying problems like this one - as we strive to improve one of the most complex pieces of software on the planet.  🙂

-Noel Carboni
 Adobe QE Developer

This worked for me, thank you. The Legacy Compositing suggestion worked. Saved my life when I was rushing for a deadline. But please, Photoshop team work on a solution for PS2020. Even if not a bug, there is no reason why this should be acceptable when every other Photoshop version has never caused an issue like this. If it ain't broken, don't fix it.

Hi again Noel,

Thanks for getting on this so quickly. Finally had the opportunity to try the workaround late last night and so far seems to allow general usability for PS 2020. Appreciate you getting on this problem right away and getting us all working again. Look forward to the final fix on a subsequent release.

Thanks again.

Hi Noel,

Thank you very much for your assistance! I remember using this Legacy Compositing for another issue in 2019 but did not test it for 2020. We'll give that a shot and report back.

I will add, we also work in non-destructive workflows as Phillip has described. And I agree, it might work for web-based art but not high-resolution for printing. Thank you Phillip for providing a file to Adobe for troubleshooting!

Update:

We have identified a workaround that has little downside and should allow you to use Photoshop 2020 for your big projects without blowing out your scratch space:

Go into Preferences > Performance and check the [ ] Legacy Compositing setting, then Quit and restart Photoshop.

Please let me know here if you continue to have any issues with scratch file sizes after doing the above.

Thanks!

-Noel Carboni
 Adobe QE Developer

Thank you everyone and especially Phillip and Greg.

We have received a file with which we can reproduce the issue where we are seeing more than 10x additional scratch data stored from Photoshop 2020 than with Photoshop CC 2019.  We're actively looking into it.

-Noel Carboni
 Adobe QE Developer

We are having the same issue on ~2GB files. Temp files of ~60GB are being created in Photoshop 2020 with every change. Mac 10.14.6. Just ridiculous and totally unworkable.