I didn't measure latencies but this is my take on how things go when I am connecting with our servers in Germany, Netherlands, UK and SIngapore. I own companies which specialize in software products.
On Nayatel alone, the resources load in an extremely long time, not at all good for general usage. With VPN they are extremely fast, from connection to transfer speeds, everything is simply unmatched except torrents with slow seeds. But same is true for if I am accessing sites in Pakistan due to obvious U-turn routing.
The argument of VPN adding latency is somewhat true and largely dependent on the VPN host, where you are connecting and obviously the routing quality of both the ISP to VPN and the VPN to destination.