My M1 Pro slows my entire home Wi-Fi

My Macbook 16" M1 Pro 2021, Ventura 13.3.1 (a) is slowing my entire internet connection at home.


When I'm not using it, I'm getting into the 30s mb/s (I live in the middle of nowhere, it'll be 2300 by the time we get fibre). But it's perfectly usable, and speeds advertised by my provider.


But as soon as I turn on my Mac, the entire speed of everything drops to <1mb/s. Whatever I'm streaming crashes, internet on my phone almost stops etc. It's as if my Mac is saturating everything and crashing everything to an unusable snail pace. Even on the Mac itself - every device is slower.


As soon as I shut my Mac everything becomes normal again.


Any ideas?

MacBook Pro 15″, macOS 10.15

Posted on Aug 20, 2023 1:07 PM

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Posted on Aug 21, 2023 1:54 PM

I just fired up a new user on an existing Mac. I told it 'later' at every turn when it wanted to talk about Apple-ID. Then when it was more convenient for me, when it I went back set up iCloud.


It turned out the default was to send my entire existence, including all photos, all documents, and several other folders to iCloud, sync all my emails and texts and passwords and additional items, too numerous to recall.


If I had let that proceed without stopping it quickly, yeah, that would have overwhelmed my internet connection as well.


Eexecutive Summary: Check your iCloud settings. Make sure you are only sending to iCloud what you intended, not your whole digital life.

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Question marked as Top-ranking reply

Aug 21, 2023 1:54 PM in response to MJWB25

I just fired up a new user on an existing Mac. I told it 'later' at every turn when it wanted to talk about Apple-ID. Then when it was more convenient for me, when it I went back set up iCloud.


It turned out the default was to send my entire existence, including all photos, all documents, and several other folders to iCloud, sync all my emails and texts and passwords and additional items, too numerous to recall.


If I had let that proceed without stopping it quickly, yeah, that would have overwhelmed my internet connection as well.


Eexecutive Summary: Check your iCloud settings. Make sure you are only sending to iCloud what you intended, not your whole digital life.

Aug 21, 2023 1:26 PM in response to MJWB25

MJWB25 wrote:

My Macbook 16" M1 Pro 2021, Ventura 13.3.1 (a) is slowing my entire internet connection at home.




The current stable release of Ventura including bug fixes, security updates is macOS Ventura 13.5.1 —I would start there

and compare your results...


Keep your Mac up to date - Apple Support

Keep your Mac up to date - Apple Support



Get on a differnt Network if necessary to download the OS update.



You can hard reboot your Modem, router, hotspot... however you are connected, then test.

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My M1 Pro slows my entire home Wi-Fi

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