SecureLine battery & bandwidth usage

I’ve installed SecureLine VPN on iPhone 5 running iOS 10.3.3. VPN works really well, I’m happy with it. Two questions:

•What’s the effect, if any, on battery usage? Does the battery need to be recharged more frequently with the VPN on all the time?

•Is client-VPN bandwidth greater than client-endpoint bandwidth?

Thanks loads for feedback!