Indeed, I had PMdebug.txt file, I have migrated settings from old computer by copying all preference folder files to new one.
About iMovie , I don?t have iMovie installed.
There is something other than PM behind this slowness, as this is not happening all the time (now I tested with same files , all looks smooth... haven?t today even rebootted my computer between good and bad runs, though have closed PM between runs)
I have some apps same time looking at same folders as PM : PathFinder or NeoFinder, But it doesn?t make difference if I shut those down when slowness happens or cannot cause slowness by starting those apps before or after PM.
Now log has these messages:
Photo Mechanic version 5.0.0.0 build 19728 (3c52d76)
[Sun Jan-06-2019 21:48:13.396][b17a4000][0860964] [056f28d6] Initializing DNS resolver
[Sun Jan-06-2019 21:48:14.134][00a7ea40][0887388] PMCache.cpp:2497 cache: main thread startup
[Sun Jan-06-2019 21:48:14.134][00a7ea40][0887460] PMCache.cpp:1129 cache: spawning 4 worker threads (8 cpus) ...
[Sun Jan-06-2019 21:48:14.389][b282a000][0967032] PMCache.cpp:2427 cache: found 5996 disk cache entries, 5996 usable
[Sun Jan-06-2019 21:49:09.939][00a7ea40][3228008] An exception of type NSGenericException occurred.
The window has been marked as needing another Display Window pass, but it has already had 3 Display Window passes.
[Sun Jan-06-2019 21:49:13.511][00a7ea40][3254400] An exception of type NSGenericException occurred.
The window has been marked as needing another Display Window pass, but it has already had 3 Display Window passes.
[Sun Jan-06-2019 21:50:03.191][00a7ea40][3283604] An exception of type NSGenericException occurred.
The window has been marked as needing another Display Window pass, but it has already had 3 Display Window passes.
[Sun Jan-06-2019 21:51:47.513][00a7ea40][3770916] An exception of type NSGenericException occurred.
The window has been marked as needing another Display Window pass, but it has already had 3 Display Window passes.
[Sun Jan-06-2019 21:55:16.575][b17a4000][3755092] [06708bf8] PMCache.cpp:1959 cache: prune oldest image info: 10100 12010 36288 46393 47490