Arch and Arch based distros run slow on my pc

I tried Arch, Manjaro and Garuda. (kde) Firefox loading times and general system donwload speed is much slower compared to windows which is installed on the second drive. Packages are updated. Instead of 930 mb/s I can get a few kb/s on speed tests and steam downloads. I tried shutting down the network adapter (can’t remeber the exact name) in terminal and then enabling it but it didn’t help.

Half a year ago Manjaro worked great for me for gaming and studying but then something broke and since then i’ve been using windows unfortunately…

Arch worked for me before the grub bug which destroyed my installation but I don’t think that this is related.

5600x B550 gaming plus installed on samsung 970 evo nvme RTX 3070 32gb ram 3200mhz windows is on a different nvme

UPDATE: Seems fine after bios update.