i know changing dns often results in you getting routed to different download servers. does doing that affect your download speeds? if so...i'd say its probably like a specific set of servers that are slow. don't want to accuse anyone of throttling without concrete proof though
i remember for the longest time i had issues with ps3 downloads. then when i got the ps4 i started getting better speeds. it seems to vary though. sometimes i've getting good speeds and sometimes it feels like i might be being throttled.
rest/standby downloading has made me pay less attention tbh...kind of slipping under the rug for me. i know it sucks really bad for those going digital. :\