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I used to get these, every 5 minutes, right on the clock. Turns out, OS X location services rescan wifi every 5 minutes, God knows why. Turn it off, lag gone.

From Apple's info page on Location Services:

> Your approximate location is determined using information from local Wi-Fi networks, and is collected by Location Services in a manner that doesn’t personally identify you.


Excessive channel scans have been a problem on Linux, too: http://blog.cerowrt.org/post/disabling_channel_scans/

It's about time WiFi radios had a separate radio for scanning.

The idea that one can retune the radio into a different channel for 100 milliseconds or so and not impact user experience is absurd.

Fascinating. I tested this on Windows 10 PC, though. So may not be the same issue.

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