here's the problem:

i have a music folder which has about 450 sub-folders (music albums)
all of these folders have a folder.jpg image so i can see the album cover art on the folder.

the problem is that Dolphin rebuilds the thumbnails every time i re-open my music folder.
which takes about 15-20 seconds.

i also checked the settings in Gwenview image viewer which apparently handles the thumbnails system-wide in Mint KDE.

anyone has a solution to speed up thumbnail generations, or at least have Dolphin not re-generate them every times i open my music folder?

Have you tried to use different settings for different folders?

thank you greatperson!

i have been trying different settings for days but unfortunately nothing seems to work.

I would suggest filing a bug on bugs.kde.org here, as the thumbnails should be cached (ideally against the folder modification timestamps - which should change when files move in or out of the folder.