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.

** Also affects: ristretto (Debian)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/965541

Title:
  opening image with ristretto from a folder containing lots of files
  shows bad performance

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