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