...To be fair, you're going to have to be jailbroken (which has other tweaks and apps that are already worth their weight in gold) but a guy who is a lot smarter than me just released a free app called "WiFried (AWDL Disable)" on Cydia that claims to fix the iOS 8 Wi-Fi issues.
And for my 5S, it has fixed my issues 100% and then some for going on 12 hours now. Which I would have normally had some lag bottleneck up without fail within the first hour or two after all of the other previously oft-suggested "fixes" for these issues.
Here's the link to how he got to the bottom of the issue and how his app fixes it -
https://medium.com/@mariociabarra/wifried-ios-8-wifi-performance-issues-3029a164ce94
And for my 5S, it has fixed my issues 100% and then some for going on 12 hours now. Which I would have normally had some lag bottleneck up without fail within the first hour or two after all of the other previously oft-suggested "fixes" for these issues.
Here's the link to how he got to the bottom of the issue and how his app fixes it -
https://medium.com/@mariociabarra/wifried-ios-8-wifi-performance-issues-3029a164ce94
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