[dolphin] [Bug 447571] Flexible or larger thumbnail size AND per folder view settings

[Méven]

https://bugs.kde.org/show_bug.cgi?id=447571

--- Comment #7 from Méven <meven at kde.org> ---
(In reply to Julius R. from comment #6)
> Hi Méven,
> 
> thank you very much for your suggestion. I think, that would be a good
> compromise. One thought though, is it really that slow to create larger
> thumbnails?

Creating a thumbnails 256/512 (with hidpi) should generally be as fast as a
512/1024.
On disk/memory that could be twice bigger though.
We use png at the moment, other new formats could be better like webp to save
disk usage and that might make 1024 thumbnails more

The issue is creating those thumbnails each time without the cache. 

> I mean yes, HDD will get reasonably slower, when trying to
> create the caches, but on the other hand, modern PCs are running with PCIE
> SSDs.
> 
You can remove `~/.cache/thumbnails/` folder to simulate the state, go to a
folder with lots of images in icon mode with the biggest zoom.
Things changed recently we load/create thumbnails on several CPU-core now, so
this feels better than it used to.
Or you can use gwenview, since it doesn't use the thumbnail cache at all.

HDD are still very big in term of usage, especially for large storage
(video/photos), and we must at least not make too bad for them, i.e only tailor
for SSD.

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