Apple - What features of Mavericks are beneficial to you?

The overhaul of the virtual memory system makes it clear that memory pressure is the primary factor to track and not how many free pages, inactive pages or overall virtual memory is allocated.

The bottom panel is invaluable for diagnosing a slow machine and knowing whether to rule out memory contention as a cause of the slowness. After running your Mac for a week, you should reach a nice steady state like shown above and can know if adding more RAM or adjusting the programs you run will affect performance.

With a text field active, Control ⌃ + Command ⌘ + Space opens a characters panel including Emojis.

The energy consumption view that collects 8 hours of history and graphs the charge level in your battery as well as showing each process that drained measurable amounts of energy is going to make squeezing extra productivity out of one charge much easier.

Not only will developers (I'm looking at you Dropbox) know that they have to be better stewards of battery life, it makes it easy to see which apps support App Nap and even that a program that is quit now was responsible for using energy in the past 8 hours. This tool provides actionable information for users to better manage their experience when away from wall power on a portable Mac.

This detail is quite hidden inside Activity Monitor, but Apple does expose the biggest users of energy in the menu bar for apps using significant energy.