VPNs by nature tend to have slower internet connectivity. A VPN connects into a separate network before you start browsing, and then runs the requests through that network. This extra step can sometimes cause some network delays in exchange for higher security.
Although a VPN does not provide complete immunity from cyberthreats, it is the safest way to get online and help reduce your risk and vulnerability, especially on public Wi-Fi. The information sent between your device and the server where it lands will be better protected than if you browsed without a VPN, making it a great addition to your cybersecurity toolset.