Typical results from OOKLA Speedtest before upgrade: Ping 17 ms, Upload 21 Mbps, Download 4.4 Mbps
Typical results after upgrade: Ping 39 ms, Download 2.9 Mbps, Upload 0.47 Mbps
iPad 2 with iOS 7.1.2 get 15 Mbps download and 4.4 upload on the same network.
Resetting network settings on the iOS 8 devices did not improve the performance.
Changing band on the router from 2.4 GHz to 5 GHz did give me back the speed on all devices.
However the speed occasonally drops on the iOS 8 devices, and the signal strengt can go from full til lost connection without moving the devices.
Also sometimes the Wi-Fi SweetSpots app report 0 mbps when the signal strenght is indicated as full and then suddenly go up to around 58 Mbps again.
It is almost like the device is trying to use cellular network that I do not have on the iPads before it suddenly switches back to Wi-fi nettwork again.
I am thinking about going back to my iPad 2 with iOS 7.1.2 that is working perfectly until the Wi-Fi issues are resolved.
Any help will be very much appreciated!
iPad Air Wi-Fi, iOS 8
This solved from video here
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UPDATE
Re: iOS 8 Wi-Fi problems
in response to E-2043
Yes, for me also. I am having problems with wifi working on my iPad Air, and to a lesser extent on my iPhone 5, after upgrading to iOS 8. My iPad is just about useless now after upgrading. It will work OK for a few minutes then the little wheel will just sit there and spin. The wifi connection to the router is there and strong, but the connectivity to the internet fails to move any data. Running a ping test shows that very few pings get through at all and when they do get through, the latency is huge.
iOS 8 update definitely is the problem as everything worked great on iOS 7.1.2.
I hope Apple is aware of this problem and will release a fix very soon.
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UPDATE FROM kate
Same problem here. Wifi not working well at all. performnace seems to be some kind of delay when submitting in safari or any other app. And another wowed thing seems to be disconnection of LTE and unable to route to destination gateway. It happened while in Seattle on ATT. Disconnecting LTE and working with 4G was fine. I'm now in Dallas and LTE seemed to work. But wifi is giving lots of performnace problems at home. I'm not ch aging my router which worked fine before I upgraded to iOS 8.
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UPDATE
ditto here....so angry at Apple....just to meet their release commitment they release this untested crap. Wifi and video playback, specifically websites loading for first time and Netflix playback, is DEAD! I can wait minutes to load Google front page and videos on Netflix are staggered. I did a wifi settings reset and it helped but still see sporadic issues. Ipad4 Retina, 64g.....is now a doorstop!
anyone find any relief?
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I had read another comment posted and this person had suggested the "Puffin Browser". I was curious whether this would make a difference at all in the issues I've been having with Safari since dowloading the ios 8 to my ipad. so I downloaded it from the app store and it works beautifully! a signifigant boost in speed, like before updating. maybe this could also be useful for someone else - at least until some kind of further update comes out.
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UPDATE
Similar problem on my iPhone 5s after updating to iOS 8. Not as bad as what you're seeing on your Air since my speed tests are at least 20 Mbps, but bad enough that apps (including Safari) periodically complain about a lost network connection despite showing 4 semicircles in the Wifi status.
I've run an app called Ping Analyzer and had it ping my router and see dropped packets periodically. Ran the same test on my old 4s and iPad 2 running iOS 7.1.2 and not seeing any where near the number of dropped packets as the 5s.
Chatted with Apple support and they had me do a restore and set up as new. I did that since I'm seeing other glitches in iOS 8. It seemed to work after that, but I only tested for a few minutes and didn't do the ping test (which I should have done as that would have given me a definitive answer). I then restored my backup and the issues returned. Apple support implied if restoring as new didn't fix the problem, then it's a hardware problem. Considering the number of reports about this, he can't be correct.
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UPDATE
Same here on my iPad Air after upgrading to ios 8 the iPad continuously loses connection with the Timecapsule2 and the internet.
WIth the Airport app you can see that all the connections are lost ( triangle shown on internet, timecapsule and airport express icon).
Also the Airplay sign is not there.
After restarting the iPad it works for a short time. Then it crashes again.
Overall it feels laggy using the ipad.
Before upgrading everything worked as a charm.
I hope Apple can fix this.
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UPDATE
I Have similar issues since the update. Wifi will start to work, the slow to a crawl the just can't reach anything on the internet any more. Rebooting May resolve, then within an hour its dead again, it's always connected to the wifi router, just can't resolve anything. This is for an iPad mini retina wifi.
So far I've:
forgot got an dreaded the network in settings
reset network settings in settings
rebooted my router
restored a clean copy of iOS 8 from itunes
None of these changed anything. I have an open ticket with Apple and referred them to this thread. They had me complete the last 2 items on the list above.
After fter apple telling me it's not possible, I successfully downgraded my iPad back to iOS 7.1.2 on my own and have no more issues.
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UPDATE
I fixed it. My router can send both 2.4Ghz signal and 5Ghz signal. For some reason it was having problems with the 2.4Ghz. I switched it to 5Ghz and not only the problem is gone, but it's hell of a lot faster due to 802.11ac . . . It shouldn't have any kinds of problems but that was my story