"The gauntlet Apple threw down to its coders in attendance is a sub-100ms response time for apps, on the oldest device they plan to support. " "Minimize your footprint, went the warning, because you really can’t be sure what other apps might be running alongside you." http://www.slashgear.com/as-wwdc-ends-the-mood-in-the-trenches-is-neighborly-14388248/ I wonder if this will be a new requirement that could keep an app out of the store. This could be an issue with apps that do work in the background because they might eat up processing power, slowing down other apps. Looks like multi-threading just became more important because I doubt they'll be able to increase the core speed much without adding heat, more so because multi-tasking and background processing is in play. Good thing Apple users upgrade in mass.