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Small tweaks to speed-up-slow-ios-downloads-with-proxy

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Wesley Moore 2013-01-13 16:18:39 +11:00
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content/technical/2013/01/speed-up-slow-ios-downloads-with-proxy.mkdn
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@ -57,21 +57,21 @@ This seemed to be the same problem I had encountered with the Radiopaedia app.
I wondered if telling the iPhone to use a proxy on the local I wondered if telling the iPhone to use a proxy on the local
network would work around the issue. network would work around the issue.
To test my theory I set up [Squid][squid]<sup>4</sup> on the Mac To test my theory I set up [Squid][squid]<sup>4</sup> on the Mac mini
mini that's connected to my TV since it's always on and has a wired that's connected to my TV. I configured the iPhone to use the proxy and
connection to my modem. I configured the iPhone to use the proxy and compared the speed with and without the proxy in use. You can see this
compared the speed with, and without the proxy in use. in action in the screenshots below.
[squid]: http://www.squid-cache.org/ [squid]: http://www.squid-cache.org/
You can see this in action in the screenshots below. The first is not In the first screenshot the phone isn't using the proxy. I have let
using the proxy. I have let it download a third of the file to be well it download a third of the file to be well clear of [TCP's slow
clear of [TCP's slow start][slow-start] and it is estimating 57 minutes to start][slow-start] and it is estimating 57 minutes to download the
download the remaining 176.1 Mb (53 kb/sec). The second screenshot (only remaining 176.1 Mb (53 kb/sec). The second screenshot (only a minute
a minute later) shows the result after I paused the download, changed later) shows the result after I paused the download, changed the proxy
the proxy settings and then again let the download warm up a little. The settings and then again let the download warm up a little. The estimated
estimated time to complete the remaining 143.8 Mb is now only 5 mins time to complete the remaining 143.8 Mb is now only 5 mins (491 kb/sec)
(491 kb/sec) -- a huge improvement. -- a huge improvement.
[slow-start]: https://en.wikipedia.org/wiki/Slow-start [slow-start]: https://en.wikipedia.org/wiki/Slow-start