Compared to OpenVPN's technology on long distances (Chiang Mai to Paris).
Well, technically, the SPDY technology (now HTTP/2) allow to multiplex connections flow, So SPDY will make faster requests on web browsing concern.
Plus, other VPN technologies (OpenVPN/PPTP/L2TP) got heavier headers, which takes more bandwidth.
How much bandwidth you got? With 150mbps Fiber, we were maxing out the bandwidth with Tunnello (120mbps+), but OpenVPN was struggling between 20-30mbps with more latency on the same server and line.
You can test it by yourself, we’d love to get a feedback if you could try both on the same country.