A. Switch to a different server location within the app. Sometimes, certain servers are overloaded or have slower speeds. Open the app, go to the server selection menu, and choose a different server, preferably one that is geographically closer to your location.
B. Check your mobile data settings. Ensure that your mobile data is enabled for the VPN app. Go to Settings > Cellular, and make sure that the VPN app is allowed to use mobile data.