But ya'll have to realize how the OS is not only running the apps, but does a huge deal of stuff in the background, small processes firing and doing work here and there (network communications, sensor monitoring for ambient light, among many other things). It's not like you start an app, and then it has full access and control over one core.
People need to learn what the hell they are talking about! Every once in a while I lose my nerve when reading all the crap that's flowing in these threads.