cat /proc/sys/net/bridge/bridge-nf-call-iptables
sysctl vm.swappiness=0
swapoff -a
No, seriously, don't. You're probably reading this because you've asked what VPN service to use, and this is the answer.
Note: The content in this post does not apply to using VPN for their intended purpose; that is, as a virtual private (internal) network. It only applies to using it as a glorified proxy, which is what every third-party "VPN provider" does.