Slow performance will large file count

[bcomer]

Can someone explain why it takes so long to display an image after selecting it from a very large set of files?

For example, I have a few hundred thousand images in one folder.
When I double click on one it takes quite some time for it to be displayed.
I see the same type of delay after selecting the Esc key to return to the file list.

When monitoring CPU core activity I see little use of multiple cores when
opening the same folder. I would expect the application to make better
use of the cores when populating the browser.

Computer is a Mac Studio M2 Ultra with 128GB of memory.

[xnview]

Do you use cache of thumbnails? If you wait that all thumbnails are created same problem?

[bcomer]

Do you use cache of thumbnails? If you wait that all thumbnails are created same problem?

I do not cache the thumbnails and use the embedded ones if they exist.

[xnview]

If you wait that all thumbnails are created same problem?

[bcomer]

It is all fine once the thumbnails are created.

It takes some time to generated them and monitoring the CPU core usage shows many of them idle.

[xnview]

so the problem is during thumbnail creation, right?