If you are having speed issues with the VPN connected, the first thing you need to do is to try and quantify the problem and to do this, we recommend that you use a speed test utility, our favourite one is speedtest.net

You can download the Speedtest App from the link below if you don't have it on your Android device now.

https://play.google.com/store/apps/details?id=org.zwanoo.android.speedtest&hl=en


Once installed, please run the speedtest twice, one without the VPN and the other with the VPN connected


Once we get these Speedtest results we will be able to assist you further in getting this resolved.