vpn如何提高下載速度？

我們都同意，更快的下載速度是可取的，並假設一個虛擬專用網可能會減慢一些事情，但如果相反的情況發生，你的虛擬專用網實際上提高了速度？有鑑於此，今天的超級使用者問答帖子回答了一位好奇讀者的問題。...

我們都同意，更快的****是可取的，並假設一個虛擬專用網可能會減慢一些事情，但如果相反的情況發生，你的虛擬專用網實際上提高了速度？有鑑於此，今天的超級使用者問答帖子回答了一位好奇讀者的問題。

今天的問答環節是由SuperUser提供的，SuperUser是Stack Exchange的一個分支，是一個由社群驅動的問答網站分組。

圖片由Lawrence Wang（Flickr）提供。

問題

超級使用者讀者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如何提高使用者的****？

答案

超級使用者貢獻者davidgo為我們提供了答案：

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:

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.
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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