Apple Catalina Appears to Introduce Massive Jitter - SOLVED!

Fri Oct 30 19:08:38 UTC 2020

Hi all.

So I may have fixed this for my end, and hopefully others may be able to 
use the same fix.

After a tip from Karl Auerbach and this link:

     https://developer.apple.com/forums/thread/97805

... I was able to fix the problem by disabling Bluetooth.

However, disabling Bluetooth was not enough. I also had to disable all 
Location Services.

After that, I re-enabled Location Services and only allowed for two 
features:

     - NetSpot
     - Find My Mac

With just those two location services, as well as Bluetooth disabled, I 
have no more high jitter.

App performance like Zoom and Youtube uploads are now crisp, with 0.0% 
packet loss.

So looks like that Bluetooth is a huge problem. Confirmed by opening the 
"Console" app, and adding "scan" in the filter bar, top right.

A peak latency of 13.5ms after 300 packets:

Marks-MacBook-Pro.local (172.16.0.239) 2020-10-30T21:06:05+0200
Keys:  Help   Display mode   Restart statistics   Order of fields   quit
Packets               Pings
  Host Loss%   Snt   Last   Avg  Best  Wrst StDev
  1. 172.16.0.254 0.0%   300    3.1   4.8   2.2  13.5   1.9

Mark.

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