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

[ray]

it seems like ristretto has a problem opening an image from a folder which contains lots of image files. maybe it loads or calculates all the thumbnails - which isn't really necessary. so in comparison to eog ristretto shows some serious hunger for cpu and it takes a long time until it shows the image it's supposed to open. this also happens if one flips to the next image. it gets super slow then also.

[Micah Gersten (micahg)]

Thank you for reporting this to Ubuntu. Which release and which version of ristretto is this?

[Launchpad Janitor (janitor)]

[Expired for ristretto (Ubuntu) because there has been no activity for 60 days.]

[jesus2099 (jesus2099)]

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.