In most cases, the performance of the VPN doesn’t depend on the provider, only on the speed of your internet connection.
Here’s what your internet service provider can detect when you use a VPN.
- The fact that you connected to some kind of a VPN server and its IP address. If your ISP has a database of IP addresses owned by VPNs, it can, in theory, detect which exact VPN you’re using.
- The time you spend connected to a VPN and the amount of data sent and received. Also, the port used for the connection.
But the provider can’t see what you’re doing when you’re connected to VPN. It cannot know what sites you visit or what videos you watch. All your internet data is encrypted.
Let’s sum up. Your provider can detect that you’re using a VPN, but it won’t know what you’re using it for. That’s why it’s also important to have the Kill Switch feature on at all times. It will protect your data even if the VPN connection goes down.