os x 10.10.3 installed and wifi slowed down

When you say 'go to Apple Store to fix this problem' you sound like you may have done just that?

If so, then what was the fix, erase hard drive and fresh reinstall? Or something else?

No, I hadn't done it in Apple Store. I think it's one of the ways to fix the computer.

Resetting PRAM and/or SMC did not help in any case. I have 3 laptopos all running 10.10.3 now, installed from Combo Update (I put the combo after I installed classical incremental and had the network problem on ALL the computers I own). Before this update the only one doing wifi problems was my wife's (13 inch retina from 2013). Now mine are doing the same problem (a 13 inch pro late 2011 and a 13 inch retina from 2014).

The wifi network connects immediately. I can ping my router but I have no DNS translations. Simply put, I can ping immediately any IP on the internet but DNS starts translating 2-3 minutes AFTER the computer was woken up. The router is an Airport Extreme and of course it works properly because the same Macs on Windows or system recovery work instantly. Thus the bug must be in 10.10.3. On my wife computer the problem is after a fresh installation, on my computers the system was yearly upgraded for the last 3-4 years. But it does not matter now: they work the same.

Anyway, do you remember that ad with "I am a Mac, I am a PC" when they say how frustrating Windows is and that at every version they say "This time it's going to be different", hoping that Windows will be better? Well, congrats Apple, you made it not at each version, but at each sub-sub-version! I can hardly wait for 10.10.4 or maybe 10.10.3.1 and hope that that time you will have someone on your team able to write a small piece of code for something totally irrelevant for today's computers like the Wifi. Thanks a lot.

BTW: My wife bought a computer a year ago and since then her Wifi is ****. A BRAND NEW COMPUTER! I at least could use mine without problems for a couple of months on 10.10 but now she had her revenge.

This WIFI bug has been there since yosemite came out. Some people have issues ever since.

They say many thing like resetting the PRAM, deleting network preferences, turning off bluetooth, turning off photos sync.

The only apparent fix is to do a clean install of yosemite again without restoring from a time machine backup (the only thing I haven't tried so far but I've read somewhere it works).

They say only people that updated from mavericks to yosemite not doing a clean install have this problem because of some corrupted network preference files when updating but I have my doubts, it looks like every update introduces the bug again unless you do a clean install. I have a late 2013 rMBP with a bootcamp partition and I have to say that when I work with the windows 8 partition I have no WIFI issues whatsoever and it works full speed so it's definitely not my router or my ISP or a faulty macbook.

They WIFI bug has been acknowledgw by apple since yosemite came out but they haven't been able to fix it and have been very vague and reluctant to give anyone support for it.

I disagree. My wife's computer was installed from scratch with OSX 10.10.2 and today after updating to 10.10.3 has the same problem with wifi.

Resetting PRAM did not help.

Apple praises that they build their hardware and software. I would accept this problem on a Windows machine because the drivers are written by someone else. But Apple has to provide drivers fir THEIR OWN designed hardware architectures and having such a problem is not less than frustrating and showing a decline of the quality of their testing.

Yeah I know the feeling, I've been doing the 'buggy wuggy' with Apple's OS X since Mavericks, prior to that, going back to 2006 I never had an issue with their OS X releases or updates.

Hate to say it but the beta testing strategy of late isn't working out too well, it needs to be more rigorous. The Late 2013 rMBP was a prime example of poor testing methods, when they released it with a bug affecting every unit, a bug which locked up the trackpad and keyboard. Something in the software department has gone seriously wrong from 2013 onwards.

Anyway back to the Yosemite bug at hand. The only temporary fix I've managed to come up with is to create a new user account on your Mac, then when you boot-up or wake-up your Mac, go to the new user account and login to that account first, you should notice that in this new user account the WiFi is lightning fast, then simply log-out of that user account and log back into your usual account and hey presto you have lightning fast internet again. (Note: Once your Mac goes into a deep sleep or you do a shut-down.restart, you will need to repeat the process of logging into the new user account first.)

Sad to have to use such a workaround, but I can't be running on 5mbps when my fibre optic is actually supplying me 55mbps. Shocking how an update is able to bottleneck your WiFi speed in such a way as this. They must have one unhappy programmer technician working in Cupertino.

This essentially means (for me at least) this bug is isolated to my user account. Not sure what this means in terms of how to fix it? Migrate to a fresh admin user account I guess, right?

Same problem for me. Macbook 13" retina late 2013...

I tried everything:

- restart routers (I have the issue at different places anyway)

- reset pram

- re-install last version of dropbox (who knows)

- reset the wifi settings

I had no problems before 10.10.3

One only wishes they could revert back to 10.10.2 and enjoy fast WiFi speeds again.

I bet many people with issue still think that it's the fault of there internet provider, not having yet tested the speed of their connection with other devices, to find that those other devices are all getting full speed connection.

Try the fix I gave above:

" The only temporary fix I've managed to come up with is to create a new user account on your Mac, then when you boot-up or wake-up your Mac, go to the new user account and login to that account first, you should notice that in this new user account the WiFi is lightning fast, then simply log-out of that user account and log back into your usual account and hey presto you have lightning fast WiFi again. (Note: Once your Mac goes into a deep sleep (more than 2 hours asleep) or you do a shut-down/restart, then you will need to repeat the process of logging into the new user account first.)"

As long as I do that then I have full speed WiFi again, I'll do this for a couple of weeks to see if Apple issues a fix, if not I may have to sadly resort to backing up the files I need and erasing my hard drive completely to start a fresh new OS X then manually migrate my files back onto it, which is a pain in the rear, but may kill of any lingering bugs from when I first bought it on Mavericks.

Supreem wrote:

One only wishes they could revert back to 10.10.2 and enjoy fast WiFi speeds again.

I bet many people with issue still think that it's the fault of there internet provider, not having yet tested the speed of their connection with other devices, to find that those other devices are all getting full speed connection.

Try the fix I gave above:

" The only temporary fix I've managed to come up with is to create a new user account on your Mac, then when you boot-up or wake-up your Mac, go to the new user account and login to that account first, you should notice that in this new user account the WiFi is lightning fast, then simply log-out of that user account and log back into your usual account and hey presto you have lightning fast WiFi again. (Note: Once your Mac goes into a deep sleep (more than 2 hours asleep) or you do a shut-down/restart, then you will need to repeat the process of logging into the new user account first.)"

As long as I do that then I have full speed WiFi again, I'll do this for a couple of weeks to see if Apple issues a fix, if not I may have to sadly resort to backing up the files I need and erasing my hard drive completely to start a fresh new OS X then manually migrate my files back onto it, which is a pain in the rear, but may kill of any lingering bugs from when I first bought it on Mavericks.

It seemed a good idea but didn't work on my side :-(

The worst part, is that I had beta version of 10.10.3 working quiet well. Only the last beta and final was quiet ******.

I think I'll probably have to re-install everything. But i'm not sure it will fix the prob.

After a few tests, I changed the DNS in my airport extreme and now it's working... basically I inverted 8.8.8.8 and 8.8.4.4. Weird because other computers on the same network (like macbook air on 10.10.3) didn't mind.

Surprisingly, blowing away my user account did fix the problem (sort of).. I'm boggled, since I deleted every pref and cache file that relates to the network, but still.....

I created another local admin account, and deleted my iCloud based account - then recreated. This resolved the network dropping.

However - I had to disconnect and reconnect a splitter box that my cable tech had made changes to while troubleshooting - this caused the bug to reoccur this morning.

Saleem's suggestion of logging in with another local account first "fixed" it - my own account then did not knock out the network.

There is still something fundamentally wrong - since one machine can cause the cable modem to drop all carrier signal (according to my ISP tier2 techs).

I'm updating my rdar - and I suggest everyone else create one at bugreport.apple.com, since Apple doesn't use these forums for feedback much.

The names Supreem not Saleem haha

I can safely say that my WiFi connection is sound and solid, with no drop outs from the end of the internet provider. For me it's simply my rMBP that's buggy within my admin profile.

I'm going to test my rMBP on a different WiFi network down at my brothers house and see if the same occurs, I think it will myself as I've cleared out all I clear out in terms of plists and deleted off the WiFi connection then re-instated it again etc etc etc

I'm getting tempted to do a full HD erase and reinstall, then build up my profile again manually in terms of putting back music, photos, videos, apps etc, start a fresh, which is no fun but if that doesn't fix any bugs that have come across from when I got the laptop (which was factory installed with Mavericks) , then nothing will.

Sorry about that..

**** Autocorrect!

i agree. i just moved from windows to mac 6 months ago and i am very disappointed.

Good luck. This is exactly what I did on my wife's computer (rMBP late 2013). It worked precisely one day good and after a night sleep it reverted to the old habit of not connecting to wireless. 10.10.3 came out and the problem spread to the other 2 computers I had never ever had a minuscule problem before.