Oh boy. You don't have a clue about what you are talking do you? Let me break it down for ya.
Let's assume you have 32bit architecture h/w and 1Gb of RAM and running with multiple s/w. Say now system consumes 512mb ram at one point in time. Now,,if you open up a new application that needs more than 512mb ram, the system writes old stuff in ram to a page file (virtual memory), to make room for the new application in the ram. Accessing page file takes more time than directly from ram and ultimately system slows down.
Ok. How about we apply the same scenario with a 64bit architecture h/w and 1Gb of RAM? And yes. You may run into the same issue. So if someone says speed between 64bit vs 32bit is 40x in a 1gb ram is the greatest lie, unless the system:
1. Requests more than 4gb ram and system installed with >4gb ram and,
2. System s/w and application s/w both ported to 64bit or
3. System s/w and application s/w both communicate with >32bit bandwidth per cpu cycle
A7 might have other h/w improvements, like increased registers and etc.., but 64bit vs 32bit performance stats are all lies
I have never said 64bit apps will never come, all I said was, it will never straight work out of the box as advertised. 
