Browser batch operations on large # of images gets slower and slower and never finishes

[andrewk8]

4.2.1 on Windows 10 x64 2004. Ryzen 7 3700X, hyper-threading on. 32 GB RAM. Have had this issue in all of the 4.2 and 4.1 (and 4.0?) releases. Older computer had only 8 GB, but upgrading to 32 GB didn't noticeably help. Clean install of LZ on a clean Windows install, meaning I'm using all the LZ defaults. LZ Memory Limit is 9808 MB.

I work with photos 24 MP and larger. A folder will have 100-200 images.

I'll do an edit on a photo with 1-3 tools. Go back to the browser. Lift the tool stack from the image I just saved. Select all the other photos in the folder. Apply the tool stack. Each apply seems to take longer than on the image before it. And memory usage keeps going up. On Image #100, it may take longer than a minute (figurative, not literal) to apply the tool stack, where it only took a few seconds on Image #1.

Batch convert is worse. The image-to-image slow-down rate is more severe than with lift/apply and memory usage grows faster. One night I left the Convert operation running over night. By the morning, it still hadn't finished converting. The LZ process still showed CPU usage. Task Manager did NOT say Not responding. Analyze wait chain said the LZ process was running normally.

A work-around is to do browser batch operations on 20-30 images at a time. Exit LZ. Then continue where you left off. Pretty tedious if you have a lot of images.

I have two sample videos demonstrating these issues. One for lift/apply, the other for Convert. There's only 1 tool in the tool stack (relight). I have Task Manager running to show the Commit Size of the LZ process. There are 131 24 MP images in the folder.

The lift/apply video actually shows an additional problem that I didn't mention above. At time 2:09, LZ starts saying "Invalid image file". I let apply run to completion, then, in the same LZ session, went back and applied the tool stack to the "invalid" image files. After a couple of tries, I do manage to get the tool stack applied to all the photos.

In the convert video, I stopped it after 31 images. Elapsed time was a little over 13 minutes. Like I said above, if I let it run to completion, it still might not be done tomorrow, so there was no point in continuing.

Lightzone Browser Lift Apply.zip

Lightzone Convert.zip