Apple Catalina Appears to Introduce Massive Jitter - SOLVED!

J. Hellenthal jhellenthal at
Tue Nov 10 14:30:05 UTC 2020

Hey Mark,

Went through a bunch of tests here. Seems I’ve cleared up the matter on this macOS[1] Big Sur at least by disabling Wi-Fi Networking under “Location Services -> System Services -> Wi-Fi Networking [2]”. It seems at least from perspective that something changed there and causes the Mac to scan more aggressively when more than one access point (generally speaking your SSID & SSID + 5G) has been logged at a location as accessible. This same thing could be observed at least on my system while having those settings turned off, bluetooth on and location services enabled and opening (Wi-Fi Explorer[3]) which puts the interface into “monitor mode” which seems to be causing the contention somewhere. After those changes keep in mind I had to restart from a full shutdown to get to some real clean ms traffic to the router and I prefer to be connected to 5Ghz before 2.4Ghz.

1. Darwin Kernel Version 20.1.0: Thu Oct 29 05:35:40 PDT 2020; root:xnu-7195.50.5~4/RELEASE_X86_64

> On Nov 5, 2020, at 00:43, Mark Tinka <mark.tinka at> wrote:
> Just an update on this re: the Bluetooth.
> I had my AirPods paired previously for single use. I don't use them on the laptop (there is some latency), so I prefer the wired earphones. But it seems like Bluetooth was aggressively scanning for them. After removing them from the system, the scanning remained, but reduced significantly.
> So looking at Console again, every so often, Bluetooth is scanning the network on behalf of the "sharingd" process.
> sharingd is a sharing daemon that supports features such as AirDrop, Handoff, Instant Hotspot, Shared Computers and Remote Disc in Finder.
> Still keeping Bluetooth off, however.
> Mark.


J. Hellenthal

The fact that there's a highway to Hell but only a stairway to Heaven says a lot about anticipated traffic volume.

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