This is targeted at the developers more than anybody. BitTorrent Sync tends to use too much power on OS X. The newest version of OS X, 10.9, makes it easy to quantify which processes are wasting power with it's new "Energy Impact" metric in the Activity Monitor. The latest version of Sync has an average impact of around 3.5, I very rarely update my Sync folders, so Sync is almost always idle (screenshot). To give some perspective, Dropbox has 0.3, Skype has 0.16, Mail.app has 0.43. On the other end of the spectrum, Chromium sits around 4.96. IMO, BitTorrent Sync should be much closer to processes like Skype and Dropbox than to processes like Chrome, especially when there is no sync activity. Earlier versions of Sync would sometimes become runaway processes, I noticed, almost maxing out the CPU. At least this seems to be solved for now. Anybody notice that BTSync is a bit of a battery-drainer? P.S. AFAIK, the energy impact is a ratio. That doesn't invalidate my argument.