Nord was pretty good and fast, but...
Since last year their browser extension has been secretly throttled. This was confirmed with their devs after multiple emails to support. They never told us about this throttle and the website continues to advertise that they do not set any limits. Most likely their support even dont know about it and will tell you otherwise, which will just show how they can make such serious changes even without careful considerations within their team.
I gave some time to see if they will fix it but after a few months it didnt sound like they cared at all. If you are reading this you probably are interested in using the extension and not the desktop app, so my advice is dont get Nord now unless you are good with being slowed.

Update:
It is the case. Anyone can try to download a file and see for themselves it can never go above a certain speed. I see some previous reviews that mention this too. Just like I said pretty much no one other than devs knows about this.
Ticket 15039623