Full disclosure, I use an iPhone 6 Plus. While there have been efforts made to "efficiently" manage tasks in the background, the 1GB of RAM in these devices are really starting to rear its ugly head even in limited use. Often I only leave 3 or so applications active in the background, such as Music, Safari and a third party social app. I don't play games, so the device isn't being taxed heavily. Even with native apps like Music, switching back to it after a few minutes of not listening to a track, the application will automatically refresh and take me back to the main artist list rather than the last track played. It seems like having more than one Safari tab open at a time is cause for refresh as well. Sometimes I will have the Google application open for a quick search, switch back to Safari or messaging for a moment, then switch back to Google and the program is already killed and restarting. I used to carry a iPhone 5, and I didn't think that app refreshing was as aggressive during iOS 6/7. Maybe iOS could be getting too bloated for its own good, but it's looking like the iPhone 6 and 6 Plus are already being hamstrung by the decision to only go with 1GB of RAM.