Where is this battery draining code from?

Slightly off-topic, so I will keep it short:

By making apps fast load that were never designed for it

Apps do not need to be designed for being loaded without a reset, they need to be able to clean up if another app is loaded without reset. Fastload Utils just enables loading every app after one that is able to clean up. There is no (intended) way to fastload with the current version if the currently running app can not clean up. There should not be any stuff accumulating except for bugs in apps regarding clean up. Real reset is still done for leaving nearly every app but clocks and launchers.

Edit: Nevertheless removing it as a possible source for errors is what I would do as well.