我们都同意，更快的****是可取的，并假设一个虚拟专用网可能会减慢一些事情，但如果相反的情况发生，你的虚拟专用网实际上提高了速度？有鉴于此，今天的超级用户问答帖子回答了一位好奇读者的问题。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

图片由Lawrence Wang（Flickr）提供。

问题

超级用户读者RazeLegendz想知道VPN如何提高****：

I was recently downloading something at 300 Kb/s, then I decided to turn my VPN on and the download speed suddenly jumped to 1.3 Mb/s. Why is this? Is it because the VPN server reduces the number of “hops” between the server and me?

VPN如何提高用户的****？

答案

超级用户贡献者davidgo为我们提供了答案：

There are a few possibilities. Unfortunately, the number of “hops” is irrelevant.

The first is compression. If the data you were downloading is uncompressed and your VPN offers compression, then this could explain it. However, most files transferred are likely to be compressed, so this is not as likely as it would seem at first.

The second and third opti*** are related and have to do with your ISP’s connectivity and restricti***. Your VPN has found a faster path to the destination data, which could be because:

1. The ISP has multiple connecti*** and the direct connection to the data is c***trained. The VPN goes across a different connection, which in turn has better connectivity to the source of the data you are pulling, thus you are routing round the congestion.
2. The ISP is shaping certain kinds of traffic, possibly by type or destination or both. It could even be by content/payload, but that is less likely. By using a VPN, your traffic is being given priority or not being capped, so you are getting better speed.

There are some other possibilities, but these are again less likely. It could be that the VPN is using UDP while your download would typically use TCP, and different optimisati*** (MTU, for example) are allowing better use of your connection. Again, this is possible, but unlikely, mainly because you would expect either a much **aller or much greater difference in speed.

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