<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr">Is it actually jitter or is it potentially the wireless network card going into sleep mode? I have seen that type of behavior on Apple products when the cards go into low power mode although I can’t say I have noticed that on my laptop.</div><div dir="ltr"><br><blockquote type="cite">On Oct 29, 2020, at 8:11 AM, Mark Tinka <mark.tinka@seacom.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
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<font face="Tahoma">Hi all.<br>
<br>
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>
<br>
At the same time, I picked up the new Magic keyboard laptop 2
weeks ago which came with Catalina.<br>
<br>
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>
<br>
I have noticed as much as 300ms+ jitter on Catalina.<br>
<br>
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>
<br>
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>
<br>
Another friend in South East Asia, testing on a 2018 13-inch
MacBook Pro running Catalina, also had the same issue.<br>
<br>
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>
<br>
<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>
<br>
For me, even after disabling all or some Location Services
features, the problem remains.<br>
<br>
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>
<br>
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>
<br>
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>
<br>
Thoughts?<br>
<br>
Mark.<br>
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