Why is iPhone 6 Wifi so slow?

According to Speedtest.net on my laptop and iPad, my Wifi network is running at ~20Mbps download speed. When I restart my iPhone 6, the Speedtest registers ~19Mbps, which is great, but was soon as I open Safari, the speed grinds to an agonizing pace, and I remeasure at ~1.5Mbps. I've repeated twice.
Given measurements in the 19 range, I think the hardware is healthy, but there seems to be a bug in the software. I've forgotten and reconnected to the network and that didn't help anything.
Has anyone else had these problems? Are they just launch day bugs?

I'm using the iPhone 5s and iPad mini with retina and I had the same issue with wifi on my iPhone 5s. I was able to solve this issue by SWITCHING OFF CELLULAR DATA by going to SETTINGS > CELLULAR. I figured the problem was related to cellular data as my iPad mini (wifi only) didn't have any wifi issues.
My guess is that iOS 8 has a few bugs with juggling between internet connections between cellular data and wifi due to new iOS 8 features such as continuity (which allows phone calls and text messaging to be made/received via iPad and MacBook) and VoLTE (which allows phone calls to be made via wifi and switch to cellular data seamlessly).
So my suggestion is to switch off cellular data whenever you're connected to wifi. I hope this helps anyone who reads this as it has helped me.

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Hey confuddled_chica!
Try the steps in the article below to troubleshoot this issue:
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/ts1398
Thanks for being a part of the Apple Support Communities!
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