Lag and stuttering are starting to take a toll on my 6 Plus and with the same setup I had on my 5. I have about only 4 apps open (Spotify with no music playing, Settings, Instagram, and SysStats lite) and the device is left with only about 100 MB of memory left. The stuttering and lag is downright bad when swiping up Control Center while on Instagram and Spotify. On my 5 i could run a lot more apps in the background and ill still be left with about 450 MB of RAM with absolutely no Control Center stuttering in any of my apps. I am in no way bashing the 6 Plus as i have been thoroughly enjoying the improved camera, amazing battery life, and HD screen but after a few days the performance compared to my 5 is rather disappointing. Im seriosuly considering exchanging it for a regular 6 and just wait when the specs are up to par for such a massive device.