The Download of Apps from the Mac App Store is very slow
Solution 1:
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.)
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.
Now we choose a third Level DNS (Primary DNS 209.244.0.3, Secondary DNS 209.244.0.4)
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Now we have to flush the DNS-Cache of the system, that OSX can use the new DNS-Servers.
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Command under Mavericks:
sudo dscacheutil -flushcache -
Command under Mountain Lion:
sudo killall -HUP mDNSResponder
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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.