Its now confirmed and reported by many techs that the current Ipad Air has a design flaw from lack of RAM.
The move to a 64-bit platform however does complicate things a bit. Moving to a larger memory address space increases the size of pointers, which in turn can increase the footprint of 64-bit applications compared to their 32-bit counterparts.
In general you’re looking at a 20 - 30% increase in memory footprint when dealing with an all 64-bit environment. At worst, the device’s total memory usage never exceeded 60% of what ships with the platform but these are admittedly fairly light use cases. With more apps open, including some doing work in the background, I do see relatively aggressive eviction of apps from memory.
Although things seem to have improved with iOS 7.0.3, the 64-bit builds of the OS still seem to run into stability issues more frequently than their 32-bit counterparts. I still see low memory errors associated with any crashes. It could just be that the move to 64-bit applications (and associated memory pressure) is putting more stress on iOS’ memory management routines, which in turn exposes some weaknesses.
and other tech sites.
The Air’s 64-bit programs take up 30% more RAM than 32-bit programs, the iPad 3 and 4 have, in effect, 40% more RAM than the iPad Air.
I had to return my Air because it was crashing left and right, and after a lot of research turns out the Air is short on RAM to run correctly.
The crazy fact that the Air has the same RAM as the Ipad 3 and 4, as I found out, is absurd, its running 64bit, IOS7, and 64bit IOS apps.