20 minutes for "save as" PNG

Here are the results on a larger file 13374x5857 flattened
Tiff .25 sec 448mb
PNG smallest/slowest 28minutes 355mb
I am moving on to the next project and will return soon to see what's next. 

I'm grateful to hear from you, @davescm 

I have reset the preferences and now had 2 updates to PS since the issue began and it continues. 

I use PNG 16bit files because it's what the printer requests. Actually he'll take JPG and then "polish and resize" them. Which is why I choose lossless instead. 

I appreciate learning more and having options, so much obliged. 

And I still want my Mtv.. I mean PNG. Currently it's needed as a transparency for web and print and the printer could want to make adjustments. 

Anyway all the details of why aside, here are the details of the save settings, I think. 
Saving an 8 bit 400x2250 sRGB PNG
Save a copy>PNG>sRGB checked> Selecting "smallest file/slowest save"
just now took 1 minute 40 seconds. 

a 16bit 1621x1080 in Prophoto RGB (checked for save) on slowest save/smallest file just took 3 minutes

I did smaller files so I wouldn't have to wait 20-30 minutes.

That is the preferences for file handling. 

Above in the thread, I ran some kind of report that was requested. 
I've also disabled 3rd part plugins and different tech previews.. all suggestions made in this thread. 
All to no avail. 

LRC is exporting 16bit PNGs and 8bit PNGs at the usual speed. ie there is no trouble in LRC. 
Photoshop doesn't SEEM to have any issues with exports or saving as other formats. 

It's just when I select "Save a copy" so I can get a 16bit PNG. (Or save a copy for 8 bit png, but at least that I can simply choose "export" instead.)

What PNG save settings?

I just ran a couple of tests on a 10800 x 5400 flattened image file with 16 bits/channel

TIFF no compression 0.3 seconds to save with a resulting filesize 341,743KB

PNG Large (Fastest save) 23 seconds to save with a resulting filesize 180,524 KB

PNG Smallest (Slowest Save) 81 seconds to save with a resulting filesize 163,697 KB

If you have seen a sudden increase in save times - try resetting your preferences (Preferences >General > Reset Preferences on Quit). These contain more than just the user settings and, if corrupt, can cause issues. They are not necessarily reset on a reinstall.

As an aside, for posting images on the web, then an 8 bit good quality jpeg is better (just don't try and use it for re-editing). The same file converted to 8 bit and saved in 1.5 seconds and gave a 19,070KB file - which will give users a much faster download on the internet. A first high quality jpeg saved from the original is difficult to tell apart. You might also consider reducing the size as , when viewing on screen there are few screens with 10,800 pixels width so your image would be downscaled when viewed. Again that would result in a faster browsing experience for users.

Dave

@CShubert 
I hope you all are doing well. I took a break from the issue for a bit. Now it is time to find a solution that doesn't require working around micky mouse's ears. 
At this point everthing seems to work except it still takes a million years to save as PNG in Photoshop. It does not take time like that to export the 16 bit PNG from lightroom. What I'm currently working on did not originate from LRC so I'd have to to ass tiff or something to a catalog then export. 

I hope it doesn't seem unreasonable that I would much prefer to be able to save as a PNG effectively from within Photoshop. 

Hi all. At one time I saw it mentioned the engineers were working on this. I took a break from the frustrations, used the workaround of opening the image back in LRC to save it as the PNG I needed. 
Mostly just chose to work on videos with Davinci Resolve instead of deal here. 

Then I got a graphic design client. I suppose I can save as a Tiff and then go import it into LRC. 
What I would very much prefer is for Photoshop to save my PNG file in a timely and efficient manner.
Should I start a new thread? Are y'all done attempting to help? 
I am not sure how to proceed. I imagined I would be asking you all to pardon me for not replying to you sooner, yet it turns out no one has offered any further solutions. That's kind of shocking to me. 

I remembered my other point from last night.. I uninstalled and reinstalled PS to no avail.

Disabling the GPU compositing and multithread compositing did not resolve the issue. 

@J453 Thanks. I'll do it because it won't hurt. 
I'll also say pardon me as my communication wasn't clear.
The issue began several days BEFORE I updated PS. I hoped the update would resolve it and it did not. 

@Hunter Wade The only things I can think of that changed in 23.3.0 and 23.3.1 were some compositing changes. Let's try disabling those settings to see if that makes a difference:

1. Go to Preferences > Performance... and uncheck Multithreaded Compositing - and restart Photoshop. Does the problem persist?
2. Go to Preferences > Performance... click Advanced Settings... and uncheck "GPU Compositing" - then restart Photoshop. Does the problem still occur?

Geewiz.. Again with the disappearing "flagged" posts.

I'd just mentioned that opening LRC and exporting a 14000 by 4000 pixel PNG in sRGB took 35 seconds. 

I think I made another point that seemed pertinent though I do not remember as I grow weary. 

Catch yall soon. TY mucho.