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jens8553b Author

Level 1

21 points

Slow wifi after Big sur update

After updating to Big sur my wi-fi speeds are at about a third of what i'm used to. Right now i get something like 50-100mbit/s both ways on my macbook and 350-400mbit/s on my iphone that is right beside the computer. I'm on a 500mbit connection and I use the same 5ghz network on both devices. Before updating I got the same speeds on both devices.

I have tried everything from this guide: https://osxdaily.com/2020/11/23/how-fix-macos-big-sur-wifi-issues/

Any other ideas?

MacBook Pro 13″, macOS 11.1

Posted on Dec 21, 2020 1:02 PM

Top-ranking reply

FA-RO

Level 1

13 points

Posted on Jan 11, 2021 10:54 AM

Hi! I'm glad I found this thread. I'm having exactly the same issue. Running macOS 11.1 (20C69) Wifi speeds are much slower (only one third or one half of the speed on all my other devices). But the strange thing is: It happens only after some time. Directly after reboot I get full speed of 500-600mbps. But then after 5 to 10 minutes I'm only getting about 150-250mbps. Then nothing can bring back the faster speeds.

Tried everything:

resetting PRAM/SMC
completely removed wifi adapter under network settings and added new one
removed wifi preferences
I'm not using any firewall/antivirus-software
changed wifi 5ghz channels, MTU size, CTR threshold
optimized all settings on my router
killed all background processes and unnecessarily running apps
disabled timemachine backup

Nothing is working. But all other apple devices in this house (two iPhone 11 Pro, iPad Pro and so on) get 500-600mbps very single speedtest. Just my mac doesn't get the full speed. And honestly this was by far the most expensive Apple product I've ever bought (2849€). So that's driving me crazy...

We need a fix for this problem!

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58 replies

aline197

Level 1

4 points

Apr 17, 2021 3:21 AM in response to Artsakh7

Genius, this worked!! you literally saved my Mac :-)

thoggs

Level 1

4 points

Apr 20, 2021 1:03 PM in response to jens8553b

here I also have the same problem, using macOS Big Sur.

clb5

Level 1

10 points

Apr 25, 2021 9:41 AM in response to thoggs

I've been having the same problem on MBP. After a few days, wi-fi speed slows across all browsers. I need to reboot the system to restore to normal speeds. Other devices are not affected.

Apr 27, 2021 5:47 AM in response to MoonJ.

A new release just came out and still no fix for this!

Apple keeps ignoring this issue exists for many many people!

Apr 28, 2021 2:22 PM in response to ricardofocp

i still have the same problem, disablr bluetooth didnt help that long. only for 20min....

May 17, 2021 4:40 PM in response to djnetworx

I guess you're lucky then) Unfortunately, still not getting full speeds here...

Artsakh7

Level 1

10 points

May 17, 2021 11:39 PM in response to BachyWachy

Can you check what frequency your router is using? if it's 2.4GHz try switching it to 5GHz, I've tested it on multiple devices and they are all working flawlessly now

May 19, 2021 1:26 PM in response to Artsakh7

THANKS! this worked on the first try. You did find the solution to this problem.

May 22, 2021 3:31 AM in response to Sharon Chard-Yaron

Thanks Sharon but I followed those fact steps before I downgraded and, unfortunately, that didn’t work fir my WiFi problem.

the usb c adapter was my main problem

May 23, 2021 1:50 PM in response to Artsakh7

I'm having the same issue. Tried the fix above with no results. If I turn off Bluetooth, however I have normal/fast download speeds.

Jun 8, 2021 7:08 PM in response to Saul Herrera

Mine has returned to slow, and with only two bars. ! Has apple commented that there is an obvious problem with either big sur and MacBook pro 16 inch 2019 or any MacBook pro?

rmpoole1

Level 1

8 points

Jun 24, 2021 4:22 PM in response to jens8553b

I tried the fix suggested by Artsakh7 but I have a problem which is that I only have a bluetooth mouse to make the files changes suggested. When I turn off bluetooth, I'm stuck. Suggestions anyone?

Jun 24, 2021 4:51 PM in response to rmpoole1

I switched to a usb wired mouse. Takes a port but works great

Slow wifi after Big sur update