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I am also experiencing major wifi issues (low bandwidth, randomly high latency) on my mid-2012 Retina MacBook Pro with Yosemite and my Asus RT-N66U router. Removing all saved wifi networks as previously suggested in this thread unfortunately did nothing for my issue.

Connecting with the Apple USB Ethernet adapter makes the problem go away, but more importantly disabling WPA encryption on the router resolves the problem. Obviously, this is not a long-term solution, but I think it indicates exactly where the problem lies...

Since I only have one machine on Yosemite. What I did was create a Virtual Router on one of my PC's using http://virtualrouter.codeplex.com/ . My old solution was creating a guest wifi without WPA encryption. It's starting to seem like Apple won't be fixing this bug with Asus routers.
 
Asus RT-ac87R

I am having major connectivity problems with the asus RT-ac87r, it drops connection and it's extremely slow, I had to go back to my old reliable Netgear N900 Router and it works fine. so it may be an issue with the AC antenna or something going on, anyone else out there with this set up. I have a late 2013 iMac. Thank you.
 
Update time for me.

I emailed Tim Cook and explained my issues and that an update from Apple would be really nice.

Two days after he replied I found I had been invited to join the AppleSeed program for Yosemites and that a beta update (10.10.2) was waiting for me.

I bit the bullet, downloaded the 10.10.2 update and I can happily say that my Wireless issues are a thing of the past.

Even better is that this beta build has been rock solid.
 
No... I'm having MAJOR wifi problems after updating to 10.10.2 on my late-2013 rMBP. It was fine for a few days but all of a sudden it started to disconnect from wifi 5 seconds after I connect to it and load a page in Safari. So annoying!! It's definitely the beta having problems since wifi is working fine on my iPad and phone. Restarting the computer twice didn't help, still disconnecting every few seconds.

This has never happened before on any previous beta builds.
 
After not having any wifi issues on my early 2013 15" rMBP since Yosemite launched (dev. builds or otherwise), the past couple of days, I've had to restart both the computer and the Airport in order to get wifi to connect. It's definitely the beta issue, as I couldn't connect to any other wifi hotspots and my other devices were connecting without issue (iMac, iPad, iPhones).
 
still have issues wifi with yosemite.. have since day one.


extremely annoyed with apple, I may not be purchasing another mac in the future.
 
No major disconnects, given I am sometimes not on the best or fastest of networks, does feel slow at times, manually setting MTU to 1453 appears to help speed up the response. Like most OS X updates Apple will remove in time, equally one would expect this to be good from day one.

Q-6
 
my wifi issues start happening when I use Airplay Mirroring. My connection slows down from 50mbps to 3-5mbps...
 
my wifi issues start happening when I use Airplay Mirroring. My connection slows down from 50mbps to 3-5mbps...

That will be because it is using the same WiFi bandwidth, once you share a connection with another service the bandwidth available for internet use will drop.
 
I'm not seeing 10.10.2 in my updates. Was it released yet?
I'm not seeing it either. Still on 10.10.1, still have major problems.

I'm running with the ethernet adapter for now. I can only get about 60% of my connection's throughput on wifi with my Asus RT-N66U router, ping times all over the place. It's miserable...
 
By now, Bluetooth interference isn't significant.

On the 2.4 band, BT interference has the same potential as it has always had as WiFi defers to BT. Coupled with additional traffic from Handoff and you have a step-change in WiFi interference possible with Yosemite.

Many post on here indicating the issue is resolved by turning BT or Handoff off.
 
I suspect it's more about drivers than Wi-Fi. For some, including me, even switching to 5 GHz does not resolve the problem. Mine actually works much better of the 2.4 GHz band. This particular problem is definitely software-based.
 
I suspect it's more about drivers than Wi-Fi. For some, including me, even switching to 5 GHz does not resolve the problem. Mine actually works much better of the 2.4 GHz band. This particular problem is definitely software-based.

Of course its software-based, otherwise reverting to Mavericks wouldnt solve this issue. By "WiFi" above I mean the software, hardware, driver stack as alll elements together define the behaviour.
 
Yes but I'm not surprised by that drop, BT is known to interfere with WiFi, my question was what you base your statement on that it shouldn't drop "that low"?

No you didn't check the post out. I get better speeds when streaming to twitch at 2500kbps at 60fps than I do with mirroring. Bluetooth off with mirroring enabled drops my connection down to 5mbps. With bluetooth on and mirroring on I get 25mbps. (Which makes no sense, because if it was bluetooth interference wouldn't my connection drop to 5 instead of 25 when bluetooth is on?) It's not bluetooth interfering with Wifi when the bluetooth is off so you don't know what you're talking about. This is definitely a software issue and not a hardware problem. My connection shouldn't drop down to 5mbps with 50mbps internet connection.
 
I just want to give a little update on my situation here. I ended up calling Apple with the bluetooth/wifi issue and the guy remote in. We tried numerous things that would be causing the issue and he actually thanked me for trying to troubleshoot it myself so the process was a bit speedy. Well.. come to find out there is a hardware issue with my Mac and I would have to send it in for repair. So for simonsi that said "this is normal", I advise you to not to take this guy's advice. I'm a computer expert myself and been in the field for around 15 years. So after I said all this wish me luck!
 
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I just want to give a little update on my situation here. I ended up calling Apple with the bluetooth/wifi issue and the guy remote in. We tried numerous things that would be causing the issue and he actually thanked me for trying to troubleshoot it myself so the process was a bit speedy. Well.. come to find out there is a hardware issue with my Mac and I would have to send it in for repair. So for simonsi that said "this is normal", I advise you to not to take this guy's advice. I'm a computer expert myself and been in the field for around 15 years. So after I said all this wish me luck!

I just think you have more than one thing going on, BT always inteferes with WiFi, whether or not you have anything else going on.
 
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