Just an addendum for clarification. If you don’t want clarification, then yes: A slower connection may cause more battery drain.
A slower connection means you would need to be on your device longer which would result in a larger than normal perceived battery drain with normal use.
An unstable connection with lots of packet losses would cause chaos with the network stack on your phone leading to more memory consumption, unneeded encryption/decryption and possibly hung TCP sessions. That would be a battery suck. In the worst cases on older devices, could even cause your phone to get a little warmer. That gets worse if you VPN client has to constantly reconnect, which is another problem.
Just an addendum for clarification. If you don’t want clarification, then yes: A slower connection may cause more battery drain.
A slower connection means you would need to be on your device longer which would result in a larger than normal perceived battery drain with normal use.
An unstable connection with lots of packet losses would cause chaos with the network stack on your phone leading to more memory consumption, unneeded encryption/decryption and possibly hung TCP sessions. That would be a battery suck. In the worst cases on older devices, could even cause your phone to get a little warmer. That gets worse if you VPN client has to constantly reconnect, which is another problem.