Slow WiFi issues after 10.10.2

This post sorted the problem. Amazing. This has been plaguing me for months.

For example, (I'm on a fibre optic internet connection) using www.speedtest.net my download rate was 4-6mbs, and after installing this extension, repairing permissions and rebooting. Doing the same test gives me 39mbs!!

Why Apple is letting thousands of people suffer with slow wifi and not patch this problem is beyond negligent.

Macbook Reina 15 Early 2013

This advice from Lysin was also helpful to me. After having wifi issues after 10.10.2, reverting to IO80211Family.kext version 7.0 helped greatly.

For each subsequent update to Yosemite, I have hoped it would be fixed - but no, I have to restore the kext again.

This weekend, I tried the El Capitan beta - it has a new version of IO80211Family.kext (version 11.0), but it still has the same problems.

Note - I find the issues are mostly with network being very slow after waking from sleep. Both slow to make a connection, and once a connection is made very slow transfer rates. System is Macbook Pro Retina mid-2014. I have tested with clean installs of both Yosemite and El Capitan. Have tried various other suggested fixes, but it seems the 7.0 version of the driver is the only one that works properly with this system.

Can anyone confirm that this is a know issue ? Lysin indicated he had communicated with Apple, and was waiting for a fix - has anything come of this ? It's a concern that the problem still exists in the upcoming release.

I have an MBP (Retina, 15", early 2013), now with 10.10.4, and I still experience this issue (slow wifi after waking from sleep - wifi speed is fine after full shutdown / re-start). I installed the 7.0 IO80211Family.kext, but it doesn't seem to have helped. Prior to 10.10.4, I did the manual switch from discoveryd back to mDNSResponder, and that seemed to help a little. I also have turned off bluetooth. Prior to the kext downgrade, I had turned off ipv6, but I now notice that it is back on. I'll try that as a final attempt. Edit: This didn't appear to help.

All this being said, my system is usable but I'm only getting ~15Mbps instead of normal 30Mbps.

Hi guys,

I had the slow internet issue for the past few weeks, not only on WiFi but also on Thunderbolt Ethernet. I tried all the solutions suggested here to no avail. Then one day I found under Network -> Advanced -> WINS my NetBIOS Name is MACBOOK-PRO which is the default value. I changed the name to something else and voila ~ the internet speed is fast as **** again (100Mbps compared to only 2Mbps for the past week). My guess is that there are other devices with the same NetBIOS Name with my rMBP - MACBOOK-PRO since it's the default name from factory settings, causing some sorts of confusion to the main internet host hence the slow internet speed (I live in my college's hostel and share network with others).

This may be applicable to those using company's network too. In short, if you share the network with other people or there are multiple MBP, MBA connecting to your network, try renaming each of their NetBIOS Name (Network -> Advanced -> WINS).

Hope this helps!

I dealt with this for a while... dumping prefs, deleting wifi service, deleting keychains, etc. it was awful

disabling IPv6 did the trick, and the wifi speed returned instantly.

you have to use terminal and enter the following: networksetup -setv6off Wi-Fi

Check this article for reference (there are many others). It will also give you the command to restore IPv6.

http://osxdaily.com/2014/04/18/disable-ipv6-mac-os-x/

Your have probably the same problem Windows 10: BCM43xx S3 resume firmware initialization problem (MacBook Pro 15 mid 2014)

It's a hardware problem from manufacturer. The link above contains exact explanation with 100% reproducible test and pictures. Duplicated wireless adapter instances results in system instability and traffic interference that reduces transfer speed. You can check your hardware also by provided test.