Free servers: There is no speed/bandwidth limitation on any free server, but please keep in mind that too many users on a respective single server will slow down speed for all. Also the distance to the VPN server might have an impact and slow down traffic.
Premium servers: The minimum bandwidth for connections using a Premium subscription usually won't fall back behind an average speed of 6 Mbps, while the maximum could reach at best (given ideal preconditions are in charge) 600 Mbps (the usual server speed). In daily life instead you should count in certain factors, which will most certainly slow down your Internet experience:
- Your original Internet connection: Regular Internet connections that don't exceed 2 Mbps can not enable higher speed, even though a VPN connection might theoretically reach 20 Mbps and beyond.
- Quality of backbones: The quality of backbones, wires and other infrastructure hardware may not allow high speeds.
- Distance to the VPN server: The nearer, the better. Near servers will naturally react faster than far away servers.
- Number of users: The more users share one server, the less bandwidth remains for each single one, since the overall bandwidth of a server needs to be divided among all users.
At www.speedtest.net you can carry out speed tests for connections between various individual countries.