Flatpak takes very long to launch

[Kabouik]

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I am using the Flatpak version of Sunshine on Guix )(I tried to make a native Guix package that I would have shared if successful, but unfortunately I failed so far) and I noticed the initialization before the monitor is streamed is actually very long, i.e., a couple minutes on a computer with a somewhat powerful Ryzen 8840U.

Unfortunately, I have no other way of running Sunshine on my system to check if the issue is with the Flatpak package, how Flatpaks run on Guix, on with Guix itself.

These are the first few lines of the verbose logs:

$ flatpak run -v dev.lizardbyte.app.Sunshine
F: No installations directory in /gnu/store/q73gdvhna0dj9cxqp2dwfg48drpn0k68-flatpak-1.16.0/etc/flatpak/installations.d. Skipping
F: Opening system flatpak installation at path /var/lib/flatpak
F: Opening user flatpak installation at path /home/mat/.local/share/flatpak
F: Opening user flatpak installation at path /home/mat/.local/share/flatpak
F: Opening user flatpak installation at path /home/mat/.local/share/flatpak
F: /home/mat/.local/share/flatpak/runtime/org.freedesktop.Platform/x86_64/23.08/f35d1c6a3c62675d2c546601f48d65c8936b3f12ff84396e9b6b21d0d749694d/files/lib32 does not exist
F: Cleaning up unused container id 753207152
F: Allocated instance id 2647144362
F: Add defaults in dir /dev/lizardbyte/app/Sunshine/
F: Add locks in dir /dev/lizardbyte/app/Sunshine/
F: Document portal not available, not mounting /run/flatpak/doc
F: Allowing homedir access
F: Allowing wayland access
F: Allowing pulseaudio access
F: Failed to run in transient scope: No systemd user session available, cgroups not available
F: Running '/gnu/store/28ifk8pbih8224nhbz2z9h5llxxld1qd-bubblewrap-0.10.0/bin/bwrap --args 34 -- /gnu/store/01lglgcswxkz0m1f34bvvgdlw7xk9z54-xdg-dbus-proxy-0.1.5/bin/xdg-dbus-proxy --args=36'
F: Running '/gnu/store/28ifk8pbih8224nhbz2z9h5llxxld1qd-bubblewrap-0.10.0/bin/bwrap --args 34 -- sunshine'
[2025-04-14 23:59:13.764807] [0x00007fef6f222000] [info]    config: 'output_name' = 0
[2025-04-14 23:59:13.765]: Info: Sunshine version: 0.0.0.df4ef62ef30e8a38d773c7777a01b8df5dbff999
[2025-04-14 23:59:13.765]: Info: Package Publisher: LizardByte
[2025-04-14 23:59:13.765]: Info: Publisher Website: https://app.lizardbyte.dev
[2025-04-14 23:59:13.765]: Info: Get support: https://app.lizardbyte.dev/support
[2025-04-14 23:59:13.765]: Info: config: 'output_name' = 0
Cannot load libcuda.so.1
[2025-04-14 23:59:13.769]: Error: Couldn't load cuda: -1
[2025-04-14 23:59:13.769]: Info: Found display [wayland-1]
[2025-04-14 23:59:13.769]: Info: Found interface: zwp_linux_dmabuf_v1(3) version 4
[2025-04-14 23:59:13.769]: Info: Found interface: zxdg_output_manager_v1(8) version 3

The specific line that takes long is that one:

F: Running '/gnu/store/28ifk8pbih8224nhbz2z9h5llxxld1qd-bubblewrap-0.10.0/bin/bwrap --args 34 -- /gnu/store/01lglgcswxkz0m1f34bvvgdlw7xk9z54-xdg-dbus-proxy-0.1.5/bin/xdg-dbus-proxy --args=36'

Any insight?

[Kabouik]

I guess this is a flatpak issue more than a Sunshine issue: flatpak/flatpak#6135