Really slow (<1Mbps) speeds on all servers

[YeOldePeanutFarmer 0]

I'm new to using a VPN so I could use some help troubleshooting this. On my normal connection I can get >50 Mbps most days, but on AirVPN I'm lucky to crack 1 Mbps, usually 500-800 Kbps. I've tried on at least 2 dozen servers, mostly in U.S. (where I am) and Canada, some in Sweden or Netherlands. I always pick servers with < 15% load and ping < 100ms. I've also tried at least 15 protocol/port settings across all 4 protocols). Occasionally I'll find a server that might get up to 3-5 Mbps initially but that will soon drop to <1. Router is a TP-Link AC1900 with stock firmware, computer is Windows 7 connecting over AC Wifi. All network adapters are set to obtain IP/DNS automatically. I suspect the router is the bottleneck here but I don't know how to begin diagnosing that. Help would be appreciated.

 

Edit: This is all tested on normal HTTP traffic tested on fast.com, speakeasy.com and speedtest.net

[draanor 0]

If you have the QOS engine turned on on your router your router might throttle your connection because it falsely believes your activity doesn't need as much bandwidth.  I had this issue with my Nighthawk router.