Generally, using a VPN service does affect connection speed to a certain extent. This is caused by the fact that your traffic is being encrypted. Besides, connection speed also depends on such factors as the distance from you to the VPN server and the server workload. However, even if there is a slight speed loss, it is compensated by such benefit as online security and data privacy.
Your VPN connection speed is influenced by the following factors:
If a VPN server has a connection of 20 Mbps or more, it is considered to be normal. This speed is enough for everyday tasks like online surfing, video streaming, and downloading any files.