I have 500/500 internet connection, Windows 10 PC, and using speedtest.net, I compared the performance of NordVPN with AirVPN.
On AirVPN, using hand-picked servers in Eddie, I'm able to achieve 120 MBit/s up/down - if I'm lucky. Often it is at the 90 MBit/s range.
With NordVPN, out of the box, I'm able to always get 300 MBit/s up/down, and regularly in the 400-450 MBit/s range.
NordVPN (in it default configuration) uses WireGuard, which certainly makes a lot of difference.