This issue report is a consequence of tests I did because of this post by @gillesdebda.
Procedure
- Downloaded a fresh installer (Nik Collection 4.3.4, according to what the installer advertises)
- Installed it on my iMac 2019 running macOS Big Sur 11.6.5
- Tested with a few images, one after the other
Observations I made when testing with Lightroom Classic 11.2
- LrC takes a fairly long time (several seconds) before even the progress bar appears
- LrC CPU load is fairly high at 180%, in view of “nothing happening”
- After several seconds (and this delay increased with every image), the tiff appears
and Silver Efex launches - Saving changes in SFX brings back the results to LrC in a second or two
- 4 images later, LrC runs at around 700%, but I cannot see anything happening…
- When I display the 4 images side by side in LrC’s compare view, the last image displays some flickering, sign of LrC doing something. Tried to screen record that flickering, but it then stopped.
Test with Photoshop 23.2.2
- Everything worked as expected
My conclusion
- Something is not right in cooperation between LrC and SFX (have not tested other apps)
- Looks like a new thing that I’ve never had with previous versions of
macOS, Nik and LrC ← all have changed since my last tests - If I get ill effects on Big Sur, the issue is not limited to macOS Monterey as proposed by @gillesdebda