Sorry iGroover, i-develop etc. etc. all of this killing processes and not doing certificate revocation checks has nothing to do with it and does not solve the problem.
The problem lies at Apple's side, not on the Mac's of their customers. It has nothing to do with my ISP or anyone else. Forget location (i'm in Europe). It has nothing to do with you.
Apple, currently, at the moment that I write this post, are actively throttling downloads. No more, no less. Don't make to much of it and don't fix problems YOU don't have...
On my MBP and iMac I am trying to download the El-Capitan installer because i want to make an USB-Stick installer. On each machine, the download starts at full wire-speed (20 MB/s) and always, after about 10 seconds, drops to less than 0.7 KB/s.
About 10 seconds full speed, then the abrupt slowdown. At least it has been like that **today**. It says nothing on how it would have been 12 hours ago, or how it will be 12 hours in the future.
At the moment, I can repeat this over and over again. At the moment of writing, Apple is throttling and larger downloads, that do not fit in that, roughly 10 second window, get shafted. It is as simple as that.
No amount of killing processes etc. etc. etc. etc. can fix this as the problem is not on our machines. Period.
At other times, I can download large updates etc. etc. from the App Mac Store completely at full speed. This varies greatly and depends on the load on Apple's servers at that point.
It has been like this for years.
This **** happens on all my Apple Devices, regardless of iOS, OS-X, does not matter. Downloads can be fast, slow or mega-slow (like now) and we can do nothing about it.
