Well, it took a while, but Apple has finally resolved whatever problem was causing wireless file transfers using its new 802.11ac MacBook Air and Time Capsule to be so slow. If you haven?t already updated to OS X 10.8.5, do it now.
When I benchmarked the new router last June, I noticed that real-world file transfers were much slower than the WiFiPerf benchmark indicated they should. WiFiPerf was reporting TCP throughput of more than 450 megabits per second (mbps) at close range, but transferring large files and large groups of files (10GB in each scenario) happened at less than half that speed.
Once I updated the MacBook Air with the latest version of OS X (10.8.5, which includes a patch to AirPort Utility), and the Time Capsule with Apple?s newest firmware (version 7.7.1), real-world wireless file-transfer speeds more than doubled.
With the old software, copying a 10GB collection of small files from the mechanical hard drive in an iMac hardwired to the router, to the SSD in a MacBook Air over the wireless network required more than 16 minutes to complete at�84.8 mbps.
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