Macbook Pro wi fi slows down when connected to external monitor

Okay, high noise makes sense.

But why is going up when connecting external monitor and fine otherwise?

Is monitor adding to noise?

Or C-Port connectivity or cable adding to noise?

Please let me know if you want me try any combination change to find the culprit.

Thanks

Some advice about the impact of interference on Bluetooth and Wi-Fi was posted in the first few replies on this thread. One includes a Trade Press article about a display that generated so much interference, it could knock out a Router if placed too close. There are also suggestions pulled from Apple articles about how to place your display and computer to minimize interference. Be sure you read all the way through from the beginning.

if you still have explicit questions after reading that, Readers are eager to make more suggestions.

I have the same display and the same problem. I've only noticed it since I upgraded to MacOS Sonoma, which is bizarre. WiFi speed is crippled when I have the second monitor on. No hubs or interconnections. Simply HDMi-HDMi.

A quick solution is to use 2.4 Ghz band from your router (if available) when faced with this issue.

5GHz connections already known to have trouble with obstacles like walls and steep angles, and whatever the display port is doing is just adding to the signal trouble thus resulting in wifi blackout.

May be Apple should look into hardware design to solve it.

Thanks

if this is a specific third-party display that is causing the problem, the issue is already identified.

That third-party display is creating Wi-Fi interference so strong, it cuts your internet speed in half.

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At the highest resolutions, the CABLES required to run these displays are not trivial.

what display(s) are being used?

what connection methods are being used?

Now you are saying that if I connect an HDMI cable directly to my MacBook Pro, I may have internet network problems. But if I connect via a HUB (or other external device) and use adequately equipped devices, I won't have any problems?

This is NOT a discussion about the general case of how to connect displays. This is a discussion about users encountering very obscure issues. if you want general advice, please start a NEW discussion and post your Mac model year, your version of MacOS, and your proposed connection method including LENGTH and TYPE of cables.

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<<. if I connect an HDMI cable directly to my MacBook Pro, I may have internet network problems. >>

I said nothing like that.

<< if I connect via a HUB (or other external device) and use adequately equipped devices, I won't have any problems? >>

I said nothing like that either.

The preponderance of evidence from the posters here leads me to believe that there is a badly-designed/defective display involved in the specific issues posted here. This is NOT a general discussion, and Readers can not just read the last post and take away ANY recommendations that apply generally.

Its a Dell Monitor, and the best part that rules out everything else is this...

On the same desk I tested with a ThinkPad running Ubuntu and another HP Laptop runnign Windows.

Now everything is same, same Distance, same Monitor, same Cable, same Internet Router.

Internet signal/speed has no issue whatsoever in ThinkPad and HP Laptop when connecting external display!!

So I guess it puts spotlight on this really being an Apple issue, isn't it?

In my case the problem was that my desk was setup in another room than the router, and I faced this issue only when I connect the external monitors.

What started working for me that I accidentally placed my MacBook's lid at an obtuse angle ~120 degrees while being on the 2.4 GHz network. 5 GHz still behaves the same and is see the issue.

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I have the same exact issue... I have a dongle with HDMI and for a while I thought it was my connection that had gone bad but indeed, whenever I watch something in streaming youtube or else and I plug it to my projector, it stops....it has to be something from your end, I have a m2 also, because I play the video and it is ok but whenever I connect it it stops

Same issue happening same with my iPad 9th gen. Feeling disappointed to have bought the digital av adapter

what HDMI cable did you buy?

what display are you connecting?