Luminar 4 4.3 - low editing performance for files with multiple changes applied / long editing history

Yesterday I've updated Luminar from 4.2 to 4.3. At glance editing performance is significantly better (cool!). However, not for files with a significant amount of changes applied.

I opened a few DNG/RAW files (small ones, about 25-30 MB each), and for new ones, with no editing history, sliders move smoothly and changes are introduced almost instantly.

For images with e.g. with 30-40 entries in operations history (note: some of them are like "Denoise enabled" and just after that "Denoise disabled" so finally change is not applied), Luminar 4.3 acts slowly.

I see "Image processing" for up to several seconds even when I am adjusting e.g. exposure. It looks like it walks through all the history entries and applies them one by one each time. In the task manager, I see almost full CPU workload (about 87-90%) so almost all processing performance is used. But still, it shouldn't work this way on high-end PCs (see specs below).

Switching between and opening RAW files is slightly faster but I don't feel it's the update I was waiting for - still far behind competitors' fluency.

I haven't checked that yet, but I hope memory leaks are fixed as mentioned in the changelog. Recently, when I tried to process a bunch of images (not batch, just manually one by one), I saw that I have used 45,7 GB of RAM (!). I had to close Luminar (4.2) and open again to release 25 GB of RAM.

What I like - look preview on mouse hover without a need to apply it and undo changes. That's cool!

I performed tests on the following PCs:

1)

• Ryzen 5 3600 - 6 cores/12 threads, holds 3,95 GHz on all cores under full load;
• 64 GB DDR4-3200 RAM working in sync mode with Infinity Fabric bus;
• 2 x 512 GB SSD NVMe with 3,3 GB/s reading and 2,3 GB/s writing performance (system and photos/library placed on them);
• GeForce GTX 1660 with 6 GB VRAM;
• Windows 10 (1909, build 18363.959) with the latest updates and drivers (including chipset, GPU, and UEFI).

2)

• Ryzen 9 3900X - 12 cores/24 threads, holds 4,1 GHz on all cores under full load;
• 64 GB DDR4-3600 RAM working in sync mode with Infinity Fabric bus;
• 1 TB Samsung 970 EVO Plus SSD NVMe with 3,5 GB/s reading and 3,3 GB/s writing performance (system and photos/library placed on this drive);
• GeForce RTX 2070 Super with 8 GB VRAM;
• Windows 10 (1909, build 18363.959) with the latest updates and drivers (including chipset, GPU, and UEFI)

On both configurations, I experienced the same issues. As the second one is much faster than the one you've been using for testing purposes (I mean https://prnt.sc/thdb14 I found in pinned thread related to release), I am letting you know, that there's something you should investigate if it is not a known issue already placed on your roadmap.

Anyway, I now feel I can go back to my photos taken nearly a year ago as Luminar 4 started working well enough to do some basic edits. I keep fingers crossed for the future updates as more complex works that require a lot of changes still make L4 notably slow even on fast PCs.