Absurdly long time to download/update games

Greetings everyone,

Hope yall are having a good day.

I've recently got myself a switch 2, first time ever owning a switch, I've came across an issue with long download time despite having decently stable and fast Internet.

I searched for solutions online so far, I've tried the following solutions:

Changing MTU to 1500 (for some reason it made download increase few hours, so I reverted it).

Disabling iPV6 both on switch and router settings.

I've tried separate connections of 5Ghz and 2.4ghz (there wasn't any big influence on the download sadly).

DNS both google and cloudflare (unfortunately nothing happened).

Updating download progress through the switch settings.

Dock station with Ehternet cable (unfortunately no luck).

And obviously restarting both router and switch 2 multiple times.

Some side notes not sure if it helps, updating the system took 6h to finish, updating Splatoon Raiders took like 1h or 2h to finish.

I never faced such an issue like this before with any other consoles, and my PC.

This is my first time ever using a switch 2, unfortunately I came across an obstacle I'm unable to solve, if anyone here could help would be greatly appreciated and thanks in advance.