[mikhailt]

Not related to this service but for VPN in general, it does this by preventing your ISP from throttling specific sets of your traffic. If they know you're downloading a torrent, they'll lower the speed. They don't know what you're doing via VPN because it's all encrypted. For an example, Verizon would limit Netflix streams at SD rate but if you watch Netflix via VPN, you would see SuperHD or 1080 rates because Verizon doesn't know what you're doing via VPN.

Of course, if you're using an ISP that doesn't throttle and follows network neutrality properly, than VPN won't increase the speed for you.