Very slow Wi-Fi internet after Monterey 12.0.1 update

I was able to work this out with a senior technician at Apple (AFTER updating to 12.1 today).

After doing a million other steps the thing that got my speed back was by going to System Preferences > Network > Location, Edit Location > Hit the plus sign and add a location (I left it "untitled") then hit done.

It took a second for the ethernet/wifi to reconnect and turn green but when they did I ran my speed test which went from 0.09 mbps upload to 50.0 mbps

An interesting point was that the speed was normal (fast) in safe mode before I made these changes.

I hope this helps. Cheers.

I transferred my data from a MBP early 2015 12.0 to the new 14" MBP 12.0.1 and the internet is incredibly slow on the 14" MBP. Personally, I believe the update is the issue since both computers are very similar and the issue only appears on the new one.

Same issue, I have an 2020 iMac with wired connection. No issue pre-upgrade with my internet speed. After upgrade it slows to a craw about 1-2 days in. A reboot fixes the issue and the speeds are back up to where they should be. This needs to get address and fixed ASAP.

Hello Captain Kirk! I am having the same issue, but on my brand new 2021 MacBook Pro with M1 Max. Unfortunately, because of this, I can't roll back my macOS to test with another release, but I do have a 2020 MacBook on Big Sur and they both have differences.

I have posted a detailed analysis of my network here: https://apple.stackexchange.com/questions/432302/macbook-pro-2021-14-wifi-with-lower-rssi-than-macbook-pro-2020-13

But, essentially, the effect I observe on Speedtest is the same as you. Could you please Option+Click on the WiFi icon in the menu bar and see if there are differences in the signal strength between the two macOS releases? You will be looking at the RSSI, Noise and Tx Rate, which tell you how strong the signal is and how fast the laptop is connected to your WiFi router. Thank you so much!

This suddenly became a problem to me. My Mac Pro (Monterey) with wired ethernet connection gets <3Mbs.

All my other devices (Windows and Android) get >200Mbs

I turned off the "Share Apple Analytics" but that made no difference.

Do I really need to rollback? The initial question was over a month ago.

I have been following this thread and others (and on Reddit as well) regarding this issue. And, I have an open case with Apple Support. I have done extensive testing and troubleshooting (documented much of it in this blog: https://www.hightechdad.com/2021/12/10/macos-monterey-slow-upload-speeds-not-your-imagination/ ).

All of my tests were with Ethernet connections (no WiFi). And all with gig internet (up and down). Bottom line - definitely an issue with Monterey. Tested hardwired on Big Sur as well as Windows using same Ethernet connection. Also tested with a neighbor using hard-wired connection, different Macs, and some running Monterey & Big Sur. Only Monterey affected.

I highly recommend people talk to Apple Support and log a bug so that there can be more reports of issues, making this a priority fix!

I reached out to Apple Support via twitter. After a lot of DMs back and forth, they escalated it and I talked to the next level support (twice now). Also 12.1 didn’t fix anything and I have updated my blog post with more information.

Right, I still want to run more tests, but I can say my speeds are better after 12.1. Mostly because they've fixed the WiFi 6 reconnection issues, so my laptop now always reconnects as WiFi 6.

I don't have upload issues, like the previous post mentioned. My problems are related to WiFi reception, mostly download. The signal strengths are still worse than all my previous laptops, and I am starting to think Apple screwed the project of this generation, as my signals get even worse when I connect an external monitor. But more on this later after I do more tests.

Odd fix, but seems to work. All other devices in the house work fine, except for my macbook pro M1 (monterey 12.1). After editing the location suggested by Kahantext, it seems to work. Before making that change, rebooting seemed to help, but rebooting multiple times per day was pretty tedious.

p.s. a similar fix was suggested for Big Sur in the post below. They also suggested several additional fixes. Wifi problems are not new for Mac's OS.

https://osxdaily.com/2020/11/23/how-fix-macos-big-sur-wifi-issues/