Comment 3 for bug 965541

I have the same here on Debian 10.4 Xfce with ristretto 0.8.3.
I open an image in a 188 image folder on a distant CIFS mount, it takes 20 seconds before I can see the image.
During this time, ristretto is frozen.
If I set up ristretto to not show thumbnails (Ctrl+M), it still takes the same time as it wants to preload them anyway.

Reducing the amount of images in the folder opens faster but I see it depends on other images, it's not very convenient when I quickly want to see an image.

I thought of some ideas:

- Reuse already calculated thumbnails (reuse of Tumbler ones? or of previous ristretto session?).
- Load thumbnails after main image in asynchronous mode. Don't load them if they are not shown.