AME Slow to Load on Import

I'm attempting to render some very large DV AVI files to MP4. Some are 10-15 minutes long, but others are in the 1-2 hour range, and one even 6 hours. (SLP VHS transfer). I do not remember AME taking forever to read the files as they are imported, and then when opening the Preset to trim the endpoint, it takes a long time before the editor even appears, and then it  tells me it's rendering for a long time.

I was watching Task Manager and found it's reading the source file as fast as the drive array will go (600+MB/sec), but it's still taking forever to load.

Is this a new behavior since the last time I did this a few months ago?

Source files are DV codec at about 30Mbps.

Once the render queue starts, they are rendering briskly as I would expect.  It's load times that is annoying.

BTW, I tested the release version, not the beta, and it did the same thing.
 
System info
    Application: Adobe Media Encoder (Beta) v24.6.0.30
    OS: Windows v10.0.22631, RAM: 63.83 GB GB, CPUs (logical): 16