I have been using Netbird for my small company of 10 people for about 2 years. Users on slow connections complained that they could not stay connected with services reliably. I could not reproduce the problem as I mostly connected from very fast connections. I thought that maybe the users or their ISPs were to blame. And then one time I was using the wifi on a plane. It was a slow connection and I was connected to an RDP server. I could not stay connected. I also has Cloudflare VPN connected to the same server. It worked really well over the same connection. I went back ad forth many times as I had trouble believing how bad the Netbird connection was. Long story short, we are now completely switching over to Cloudflare VPN. It is free for first 50 users and is very very reliable, in our experience.