<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hey Mark,<div class="">Good shout with debug, same issue seen on MacBook Air with Catalina 10.15.6 beta, pings upto 150ms seen</div><div class="">iMac with Sierra zero jitter and usually sub 1m pings</div><div class="">Now need to find out why, I never noticed as wife using the MacBook Air :(</div><div class="">I cant yet update to big sur since need lots of sad space, need to cutdown on university docs me thinks</div><div class=""><br class=""></div><div class="">Col</div><div class=""><br class=""></div><div class=""><div><blockquote type="cite" class=""><div class="">On 29 Oct 2020, at 12:07, Mark Tinka <<a href="mailto:mark.tinka@seacom.com" class="">mark.tinka@seacom.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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<font face="Tahoma" class="">Hi all.<br class="">
<br class="">
I've been on High Sierra for several years now due to a limitation
with an app that couldn't deal with Apple's latest rounds of
system permissions since Mojave. Eventually, I gave up on waiting
for them to fix it and upgraded my older Butterfly keyboard laptop
to Catalina 4 weeks ago.<br class="">
<br class="">
At the same time, I picked up the new Magic keyboard laptop 2
weeks ago which came with Catalina.<br class="">
<br class="">
Over the past week, I've been troubleshooting a massive jitter
issue on Catalina, just between itself and my home router. For
control, I have a Windows PC (tower-top) using a wireless adapter
to connect to my home network. That has no jitter at all.<br class="">
<br class="">
I have noticed as much as 300ms+ jitter on Catalina.<br class="">
<br class="">
I then asked a few friends around the world to run tests for me on
their own Catalina installations to their local router over wi-fi,
and the results are the same. Jitter so high that what should be a
1ms - 5ms latency can (for a short period) jump to 200ms+, 300ms+,
400ms+.<br class="">
<br class="">
On the off-chance that it is an issue with the new wireless chips
on the later MacBook models, one of my friends tested the same on
a 2013 MacBook Pro running a beta version of Big Sur. Same story!<br class="">
<br class="">
Another friend in South East Asia, testing on a 2018 13-inch
MacBook Pro running Catalina, also had the same issue.<br class="">
<br class="">
A Google search suggests that this is some known issue since
Mojave, to do with Location Services, and some other apps, in a
non-deterministic way:<br class="">
<br class="">
<a class="moz-txt-link-freetext" href="https://apple.stackexchange.com/questions/263638/macbook-pro-experiencing-ping-spikes-to-local-router">https://apple.stackexchange.com/questions/263638/macbook-pro-experiencing-ping-spikes-to-local-router</a><br class="">
<br class="">
For me, even after disabling all or some Location Services
features, the problem remains.<br class="">
<br class="">
Is anyone else seeing this on their Catalina Mac's while on wi-fi?
If so, does anyone know what's going on here?<br class="">
<br class="">
Ideally, this wouldn't matter if it was just a cosmetic issue -
but I do actually see physical impact to performance of network
access to/from the laptop, which has all the hallmarks of high
jitter and/or packet loss. <br class="">
<br class="">
An app like Zoom, which can display network performance data for a
session in real-time, does indicate nominal packet loss for audio
and video on this device, while other devices on the same WLAN are
happy.<br class="">
<br class="">
Thoughts?<br class="">
<br class="">
Mark.<br class="">
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