Delay in COSMIC Files before displaying files when opening

[Thatoo]

Recently, I face a delay (about 5 sec) when I open COSMIC Files before it effectively display files and folders.
After opening, I can navigate smoothly and fast.

[johnnyq]

I get the same but only with folders with lots of files in them and with most network folders deff noticiable on DAV File Shares. Gnome's File Manager does a lazy loading feature while Cosmic files does not at the moment. Cosmic Files tries to load all files into buffer before it displays them.

[Thatoo]

Here is a visual of what is displayed during the 5 sec delay when opening Cosmic Files app :

Once it display all folder and files, then it works nicely and fast but if I close the window and open again later Cosmic Files app then again I have to wait this delay.

[Thatoo]

Here are logs if I launch Cosmic Files from Terminal. It seems then linked to the NixOS install :

[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/home/USER/.local/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/nix/store/5ycrr2a710rnni67j9lnv3p4hsz05w93-desktops/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/home/USER/.local/share/flatpak/exports/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/var/lib/flatpak/exports/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/home/USER/.nix-profile/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/nix/profile/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/home/USER/.local/state/nix/profile/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/etc/profiles/per-user/USER/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/nix/var/nix/profiles/default/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/nix/store/fjndc5kmxgc1xdasj0pxwr4s6m3kmfg5-cosmic-applibrary-1.0.0-alpha.7-unstable-2025-05-02/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/nix/store/zdp19w6s9sw7h0kmdha48n65ziqmfrn3-cosmic-settings-1.0.0-alpha.7-unstable-2025-05-02/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/nix/store/vllzngb58jrlqmpm2nlixhzfrbx79sb6-cosmic-icons-1.0.0-alpha.7-unstable-2025-03-21/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/nix/store/v20n4npjfwlys7r1n0bh8aa1lg5nb7nb-cosmic-term-1.0.0-alpha.7-unstable-2025-05-09/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/nix/store/9h3kvq8nbcxvqbg38g31flj68djl4180-cosmic-settings-1.0.0-alpha.7-unstable-2025-05-09/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/nix/store/vllzngb58jrlqmpm2nlixhzfrbx79sb6-cosmic-icons-1.0.0-alpha.7-unstable-2025-03-21/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/nix/store/jpfnq8agikgnfkhy7qkz9wzxilrwlm8n-cosmic-files-1.0.0-alpha.7-unstable-2025-05-09/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/nix/store/9h3kvq8nbcxvqbg38g31flj68djl4180-cosmic-settings-1.0.0-alpha.7-unstable-2025-05-09/share/thumbnailers": No such file or directory (os error 2)
[2025-05-12T07:08:08Z WARN  cosmic_files::thumbnailer] failed to read directory "/nix/store/vllzngb58jrlqmpm2nlixhzfrbx79sb6-cosmic-icons-1.0.0-alpha.7-unstable-2025-03-21/share/thumbnailers": No such file or directory (os error 2)

[WatchMkr]

This may have been fixed with #958. If on a different distro than Pop, the fix will arrive when we tag the next release.

[fizzyizzy05]

I just tested this again compiling from git master on Arch. Still had the issue until I cleaned out the Trash folder, at which point it worked fine. It contained files on an external file, so I wonder if that had anything to do with it.

[Thatoo]

Indeed, as soon as I empty my Trash folder, Cosmic Files works again very fast and smooth.
I can't say if I had files from an external disk in it though, could be.