Downloads: disable parallel downloads unless connection is fast

[ell1e]

I've noticed minigalaxy seems to always download 3+ parts at once. This isn't a good idea on a slow connection and will only make everything slower and cause more dropouts. Therefore, I suggest this should only be done if the connection speed exceeds a certain threshold. Not sure where that ideally would be, but I'm guessing something like 10mbit/s as an absolute minimum.

Affected minigalaxy version: 1.3.2 (latest flatpak stable)

Affected operating system: postmarketOS 24.12 based on Alpine 3.21.3

[sharkwouter]

Thanks for this report. Maybe making the amount of download threads configurable would be a good solution for this.

[ell1e]

Most users probably won't think to configure it, so the default behavior might still be relevant.

[sharkwouter]

Fair point. I do think making it based on download speed would be harder to implement, but not impossible.

[GB609]

I'd just give an option and introduce a way to dynamically change it in the downloads ui. The config option could then just use the current constants as default fallbacks.
Maybe just a small numbers dropdown in the 'active downloads' section.