After I restored my computer to a clean reinstall of El Capitan, I have experienced incredibly slow download speeds in Apple applications only (Safari and the App Store). I tested downloading a file in safari, and I got around 256 kilobytes per second, but when downloading the exact same file with the exact same internet connection, I got much greater download speeds of around 5 to 6 megabytes per second. The same thing is happening in the App Store, with download speeds averaging around 256 kilobytes per second.
I have tried changing the DNS to both Open DNS and Google Public DNS, and none of them seem to fix the problem.
Again, I am having extremely slow download speeds only in Apple applications. (Strangely enough, browsing speeds are still very fast. Only download speeds are slow.) This is a very strange problem and I have no idea what is causing them.
Please let me know how to fix this.
Make sure those entries are above anything else in there.
Best Answer
Seeing as others are mentioning this issue might be related to a specific ISP, try enabling a VPN and re-running the download.
This mightn't be a long-term solution, but it should help you identify if the issue is the ISP performing traffic shaping App Store packets.