some questions about VPN from a newbie

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1. Different people use VPN for different purposes. A lot of HK people work in China, just like their mainland counterparts, they  use VPN to penetrate China's great firewall.
2. Depend on the ISP. Some ISPs assign fixed IPs to their clients, some dynamic IPs. If you want to hide your IP, set up a VPN in China.
3. Connection speed certain is a significant factor. Besides, there is also upper limit on the speed of a VPN. Once the connection speed is up to a certain level, any further increase can only have a very limited contribution on the overall speed of the VPN connection.  A PPTP VPN server can run faster than an OpenVPN. The fastest VPN seems to be Softether VPN.
4. That is for sure.
5. NIL