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