This is still an issue a year later. My PS4 was downloading a 17.7 GB Destiny update at 50 Mbps (on a 150 Mbps connection) from a nearly Level 3 server when it randomly decided 10 minutes in to switch to using a crappy Akamai server several hundred miles away at a speed of 250 Kbps (yes K).
What was originally going to take less than an hour now says it will take 18 hours.
What was originally going to take less than an hour now says it will take 18 hours.