
Measure your ping, download and upload speed. Run it once with your VPN off and once with it on to see how much speed the VPN costs you.
Ping is how long a small request takes to reach our server and come back. Jitter is how much that time varies. Download and upload are how much data your connection moves per second, in megabits.
Your traffic takes a longer path, through the VPN server, and is encrypted on the way. A nearby VPN server with spare capacity keeps the difference small.
In Germany. Results are best for connections in Europe; the further away you are, the higher your ping will be.