A few days ago, I upgraded my 3G model into a 4G model (it's white if that makes a difference), and I notice as soon as I use it, the retina display is gorgeous but at the same time the fps is staggering. So I download "Memory Manger Lite" on both, which I used to see how much free RAM I had on my 3G and I restarted both devices and cleared all cache/multitasking. I have around 254 MB RAM on the 3G and 219 is being used and 120 is available. It says 6% is inactive of that amount. On the 4G it has 248, 200 is being used and only 50-60 is available at a time completely fresh, 13% of that is inactive. Both devices are running iOS5. Is this normal? My memory runs out a lot faster on the 4G and the FPS drops quite a bit more. I suspect it's the retina display that takes up the memory, but I haven't found anything on that yet... Thanks.