I installed Mavericks the other day and noticed that I was experiencing severe battery drain. I'm debating on trying a fresh install instead of the upgrade. I notice that "Kernel_Task ReportCrash & Window server" are heavy users of CPU but I was doubting whether they were the cause. When I first boot I'm drawing -2500 amperage, but it slowly goes down to -1700. Yesterday, on a side note, I noticed that the system was using 14gb of RAM to run safari. This is what is leading me to possibly reinstall. Either something is wrong, or the system is utilizing all that RAM somehow. Anyone else experiencing shorter battery?