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I've wanted to download an app from the Mac App Store. But the download is much slower than normally.

What can I do?

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  • Have you tried different internet connections? Are other internet things slow? Have you tried rebooting? Go to speedtest.net - what speed do you get?
    – niico
    Commented Oct 19, 2014 at 15:28

1 Answer 1

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To download with normal speed again, you can do the following trick:

(These first two steps weren't necessary for me and it worked for me without doing that.)

  1. First open System Preferences → Network → Advanced and choose the tab "DNS" and add another DNS-Server by clicking on the +. A list of free DNS-Servers can be found at about.com.

  2. Now we choose a third Level DNS (Primary DNS 209.244.0.3, Secondary DNS 209.244.0.4)

  3. Now we have to flush the DNS-Cache of the system, that OSX can use the new DNS-Servers.

    • Command under Mavericks:

      sudo dscacheutil -flushcache
      
    • Command under Mountain Lion:

      sudo killall -HUP mDNSResponder
      

The reason this may improve download speeds is that DNS servers may return endpoints to Apple's CDN according to the location they think you are coming from. If you use a general one (not one from your ISP, or otherwise close to your location) you may get a CDN endpoint that is not optimal for you, resulting in slow/stalled downloads.

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    Also it would be helpful if you answered the why of needing to change DNS servers. The speed of DNS resolution may impact the speed at which a file begins downloading, but it should not have any affect once the file is downloading.
    – tubedogg
    Commented Oct 20, 2014 at 4:24
  • Why would this level3 DNS be any better than Cloudflare or Google or anyone else? Or is the idea just to have something that is not what your ISP gives you? Commented May 15 at 21:25

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