Servers that focus on response time over bandwidth
I use VPNs mainly for work, and on the weekend, gaming. In both cases, the very lowest response time is all I am after. I couldn't care less about the amount of bandwidth available. So a server/service that aims for the very best international routing + not used for high-bandwidth applications + whatever else can be done to improve response times.
Example: I work in Asia but the servers are all based in EU. The routing is pretty crappy at times, and I usually average about 280ms response times. I have very briefly hit 150ms at times, but it never lasts. Since my work is usually through terminal access, high pings make typing very very horrible.
You can not change your main route through the internet with a VPN.
That is the only chance you have in changing your latency. The other method are snake oil like Killer NIC cards and VPN routes through the net.