ojala: Alexa lists TradeMe, NZ Herald and Stuff, followed by on-line banks, the largest local NZ sites. Take something like NZ Herald, what level of traffic do they generate? 1 Gbit/s at peaks?
I'd be surprised if it was anything near a gigabit for NZ Herald. 200Mbps at most, and more likely less than 100Mbps.
ojala: How much traffic do the ISP's exchange, does any of the NZ IX's publish their statistics? APE, WIX, at what level are the traffic through them, 10 Gbit/s, 20 Gbit/s? Do the largest IX'es already do 10GE?
Sadly no IXPs in NZ post statistics, largely due to their legacy architecture which makes it hard to identify IXP traffic vs. customer traffic.
Anecdotally I'd imagine the traffic at APE and WIX to each be 2Gbps or under; anecdotal evidence of other private peering links would suggest maybe another 1-2Gbps on top of that. The IXes do not (currently) do 10GE because there's no demand for it. The volume of traffic in New Zealand over all is very low, and the onshore traffic is extremely low.
ojala: Take a random big NZ ISP, how much international capacity do they have in place? Multiple 10GE's? A smaller ISP, GE with a few hundred Mbit/s of CIR?
There's a huge gulf between the largest ISP and the next largest. While the largest might be in significant tens of Gigabits, the next largest probably isn't. I'd be very surprised if any but the largest two were running "multiple 10GEs" that were actually carrying significant Gigabits. They might be a 10G port but sub-rate services.
freitasm: As part of our work I started using a CDN. I couldn't find anything locally, I guess because a New Zealand CDN would only be viable if a large provider could peer with Telecom, Vodafone and TelstraClear in each of the major locations (WLG, AKL, CHC, DUD), but seriously I don't think it would affect speed that much.
I guess you could talk to Orcon now...
Zeon: There was a site that was posted on GPforums which had some info about various AS (autonomous system numbers, ISPs usually would have one for their BGP peering). Ran a few ISPs. Not sure how accurate but:
This almost certainly would have been PeeringDB.com (Telecom, Orcon) but note that these are self-published indicators only (you could easily put "1Tbps" in there if you wanted) and you really need to understand what you're looking at with those statistics. For instance TNZ's includes their retail and wholesale customer bases, including those in Australia.