The current theory, first published at Anandtech, is that OS X is not properly scaling TCP window size during file transfers to allow the MacBook Air’s 802.11ac client adapter to achieve peak performance. But these real-world file transfers defy that expectation. And that’s certainly what my WiFiPerf results indicate.
WIFIPERF IOS 9 WINDOWS
(Click to expand chart.)īased on my experience testing 802.11ac routers with Windows machines, I expected the 802.11ac Time Capsule to be considerably faster than the 802.11n model. Obviously, none of those figures are anywhere close to WiFiPerf’s result of more than 450 mbps.įile-transfer performance wasn’t much better with a single large file. Copying that same file back to the MacBook Air: 163.5 mbps (about 8.5 minutes). The Time Capsule’s network performance improved only a little when copying a single 10GB file from the iMac to the MacBook Air, to 134 mbps (averaging 10 minutes, 13 seconds). Something in OS X is preventing the 802.11ac Time Capsule from delivering maximum performance with wireless file transfers. Reading those files from the MacBook Air and writing them to the iMac happened at a slightly faster pace: 132.1 mbps (nearly 10.5 minutes). When I copied a 10GB collection of files and folders (videos, music files, word documents, spreadsheets, and the like) from the hard drive in an iMac hardwired to the Time Capsule to the SSD in a wirelessly networked MacBook Air (which was again about nine feet from the router), I measured throughput of just 84.8 mbps, meaning the transfer required more than 16 minutes to complete (each test was performed three times and the results were then averaged).
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