ios 11 slow wifi speeds

Me (iPhone 7 Plus) and wife (iPhone 6s) both have extremely slow wifi since upgrading to iOS 11.0.1. It’s basically unusable but running off 4g and turning off wifi makes downloads fast again. It is very frustrating as our iPad 4 works normally on wifi. Wifi for everything else in the house is fine.

I’ve literally tried everything to correct this speed issue with my iphone 7 Plus and 6 Plus.

I’ve restored as new (loading new without a backup), reset all settings and even replaced our modem. iPhone is inconsistent with speeds, in same area our iPads (Air 2 / 10.5) get full speeds.

Oddly enough, I can switch Airplane mode on/off on the iPhones and speed comes back temporarily. Eventually goes back to same behavior.

I’ve run plenty of tests within 15-30 seconds of each other on identical servers and the iPads are always rock solid. The iPhones are inconsistent (1/2 speed or less of iPad). Never saw this behavior on iOS 10.

It has to be some kind of software issue. I’ve reported to Apple several times. Hopefully they will fix soon.

It’s def a software issue. My wife has the exact phone I do (except in white) and she gets mail super fast. Of course same network etc. I even have more space than she does AND she is on 11.01, not .02

Turning OFF cellular assist when WiFi is slow helped somewhat. This is a dumb setting anyway.

I have 3 google email address it checks. My response with NO NEW mail takes longer than my wife who receives 45 messages. Explain THAT

I may have inadvertently found a fix for the slow WiFi speeds.

I reset all settings on my 7 Plus again. As I was entering my settings, I disabled “WiFi Assist”. I then swiped up for the control panel and disabled/enabled “Cellular Data”. After that, both our phones are getting consistent WiFi speeds like our iPads.

This has been several hours now and still working fine. Maybe something folks here can try?

Maybe this issue has to do with a “Cellular Data” and WiFi conflict in the software?

Fingers crossed. If it reverts back, I’ll update the thread.

what settings did you leave the Cellular roaming data at? did you enable Voice and Data?

I honestly think that its what you said, that Cellular or LTE and wifi are fighting one another, not knowing who is in control..

I performed your steps and it does seem snappier...I will know when i get to my home network, were there are limited number connections

Roaming Off. Voice & Data On. I’m on a home network as well. Let me know how it goes on your home network.

My 7 Plus seems solid. I‘m trying to determine if wife’s 6 Plus is okay. Still testing.

I’ve reported this bug several times to Apple, with diagnostic logs.

It may be slightly better but the speed is noticeably slower than my wife’s 6. Sage phone

Def something to do with the speed in which the WiFi connects.

I will admit my phone has much more use than my wife’s. She is mainly on her iPad.

Also, why can’t I scroll the mail while it’s trying to connect? It doesn’t become live for 8 seconds

After plenty of testing, iPads (Air 2 / 10.5), iPhone 7 Plus (after reset all settings) are working fine on WiFi.

6 Plus is erratic on WiFi. Seems keychain is messed up between the 6 Plus and the Air 2, which are linked via wife’s iCloud account. I’ve reset her phone and no luck. Just so weird. Hit or miss. Sometimes gets consistent speeds, then reverts back to getting lousy speeds. Has to be some conflict in software. Just will have to be patient for fix.

But what software is different between the 6 and the 7 phones? It has to be a wifi driver right? Or the older wifi chip software... I wonder which wifi chip we have, the qualcom or the other one...forgot which manufacturer.

I have the Qualcomm on my 7 Plus.

All I know is, on iOS 10 the 6 Plus got full WiFi speeds consistentry. It can get full speeds at times now, but seems to revert to slower speeds for some unknown reason. Something is conflicting. I’ve done everything, including replacing router/modem.

Hey guys, this might help solving the problem, i have tested it

When you are in ios 11, automatically when you start up your phone, the cellular data is turned on along with the Wifi connection,

in short, you just have to shut the cellular data off, the wifi speed did enhanced a lot. This helped me, but still wait and hope Apple fix this as soon as possible.

I will try that but that’s not a real world setting. To have to toggle that every time I leave a hot spot is unreasonable.

It’s not handing off....

Hey I wonder if handoff has something to do with it

I’ll try this later on my wife’s 6 Plus, but you’re right not a real world setting.

It’s odd that my 7 Plus is fine now after resetting it. The 6 Plus, even after reset, no go. Going to keep messing with it tonight, but has to be software related. Never happened on iOS 10.

Hi. JUST noticed as well my WiFi speed on iPhone 7 went from 360mb to 50mb after installing iOS 11, turning cellular off sorts the problem but shouldn’t be like that. Has anyone let apple know about that issue?

I can confirm that turning off cellular data makes the mail app more responsive from the start. I can scroll the already loaded emails while it checks in the background.

It’s still rather slow checking. Let me check with speeed test and also my wife’s phone