For an ISP that peers everywhere I'd have thought downloading from NZ mirrors would be relatively quick, however I noticed when updating a few linux distributions dotted about that it feels slower than Spark
E.g. from a server connected at 10gbit (on the 900/500 plan)
From ucmirror.canterbury.ac.nz it's slow at around 240KB/s - I can't recall if they rate limit downloads, so might be an outlier
From mirror.fsmg.org.nz it bounces between 5-2MB/s
From some random Australian one its ~30MB/s
I didn't think to do before/after tests but I don't recall Spark being this slow to those mirrors, but somewhat amusing it's faster from Australia.
Had a friend download the above on his Spark connection, and its ~35MB/s from fsmg and ~16MB/s from ucmirror