802.11n perf problem solved.
After some further digging, I think I sorted out the problem with our wi-fi setup. While the Airport Extreme is a 802.11n router, it will not run WDS in n mode. It limited the bandwidth to G levels (54mbps).
Fortunately, I stumbled across this article that basically says to punt on WDS for n routers and instead just use the “Extend a wireless network” option. Once I did that and moved all my 802.11n devices onto that new network, everything seemed to be back at it’s right performance.
Hopefully my early returns hold and this a permanent fix.

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