Slow wifi after Big sur update

guys did the last system (11.3.1 (20E241)) and safari update ( Version 14.1 (16611.1.21.161.6) ) resolve your problem? i think yes because now i have finally full speed again without trying to fix it.... ???

Oh yeah - I'm using 5GHz only and on a dedicated channel - so definitely the right settings all the way.

Same situation as in my first post:

If my iPhone 12 Pro and ASUS RT-AX55 support Wi-Fi 6 - then I should be getting the 700-800mpbs that I'm paying for. My ISP provides 800mpbs, confirmed by Ethernet on both - Mac and Windows - so I should be getting at least 700mbps on my iPhone 12 Pro(Wi-Fi 6), iPad 7th Gen(Wi-Fi 5) and MacBook Air 13 Retina 2018 (Wi-Fi 5). Currently, I cannot get over 450mbps on iPad and MacBook Air, iPhone 12 Pro goes up to 550mbps, if you switch to AX Settings only.

Update 5-21-21

Just wanted to give an update in case this helps someone else.

I tried all the solutions above and they DID NOT WORK for me.

However, I managed to downgrade to 11.3 to 11.2.3 using these instructions:

https://www.youtube.com/watch?v=TDUYiMIT4jM&t=191s

and these installers:

https://mrmacintosh.com/macos-big-sur-full-installer-database-download-directly-from-apple/

What happened?

My wifi no longer disconnected and stopped saying NO INTERNET so that was good.

However, I noticed my internet was still about only 25% the speed of every other device in the same room (mac mini was getting about 50mbps when all other devices, including an older mac mini, were getting 100-200 mbps).

So, I read this:

https://www.reddit.com/r/apple/comments/9290dr/usbc_adapter_kills_my_wifi_on_mbp/

And it turned out that once I unplugged my HDMI to USB C adapter I got FULL SPEED!

So, to summarize, the fix that worked for me was to:

1 - downgrade to 11.2.3

2 - unplug the USB C adapter

Now, of course, leaving the USB C adapter is not a permanent solution but it is a work around for now. I have since ordered 4 more adapters of various brands to see if the shielding is better on one of those (fingers crossed).

Anyway, I hope this helps others that might have the same setup as me.

If anyone wants an update on the new adapters, just post here and I'll come back to update.

Cheers,

Saul

Weirdly, it did work for me and now it seems be recurring. Might have been a freak system clash but by turning off wifi earlier, then bluetooth, then wifi back on, then bluetooth it seems be fine again.

God knows what the root of it is but it's doing my fuçking head in.

I'm glad I'm not crazy... I just received my MacBook Pro 16' and the connection on wifi is horrible; I get 2 MBPS vs. 80 on my iPhone and iPad. and no speed issue on my Mac mini either (on Big Sur as well).

I tried everything listed in these posts: disconnect the unlock with watch, rename Bluetooth file, take my network off, restart, and put it back on, and still only one bar on my network. I use a Luxol network, restarted all the routers, and still no luck.

Very frustrating Mr. / Mrs Apple. We need help here, especially after shelling out 3 grands on a laptop!

Saul, i was having a similar problem/ slow wi fi, but 300% faster on an older computer sitting side by side, and this is the solution that worked. Artsakh7 had it right, at least in my case.

For me the wifi disconnects randomly after upgrade to Big Sur! Looks like the 5Ghz freq in this release is broken because when I switched to a 2.4Ghz wifi it works fine.

The workaround to disable unlocking with the apple watch worked für me!

I don't have Apple Watch so that option is not available for me.

What I've noticed is that the wifi speed drops down a lot if I connect my apple magic mouse 2 via bluetooth, as soon as I turn it off the speed gets back to normal, is anyone else experiencing this?

Could you please give it a try disabling unlock with Apple Watch and reboot your Mac? Since I did this I never had any wifi issues again and constantly 700-800 Mbit/s.

I'm gonna try this tomorrow as reading this thread has made me realise I'm not going mad. It's definitely since the update the other day, and as people describe. Truly maddening behaviour.

Cheers.

.

Hi,

I think this is my first post here. Just want to say that your tip was SUPER helpful.

Thank you

It's ridiculous that this is the fix, but it worked great for me. Thank you for the help!