Why does IOS8 drain my iphone5 battery?

Does anyone know why IOS8 drains my iphone5 battery?  The battery life was not great before and now it has about half the life on it. I've also noticed that my phone's programs run slower (particularly iphoto and safari).  Has anyone else noticed this?  Is there a way to change this?  Is it possible to go back to IOS7 or is a new update coming out to fix this problem?

It's probably an app that's gotten stuck. First thing to do is to is the following procedure:
Close all open apps by double-tapping the home button, then swiping up and off the screen with the app window (not the smaller icon).
Reset your device: hold down the home button along with the sleep/wake button until the screen goes black and you see the Apple, then let go. (No data loss)
Now read this article and adjust your settings as advised: http://www.overthought.org/blog/2014/the-ultimate-guide-to-solving-ios-battery-d rain

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