Even though we're now on the cusp of OS X Yosemite 10.10, it's worth remembering that Mavericks is till the current version of Apple's Mac software, and with reports suggesting that Yosemite won't hit the Mac App Store until mid-to-late October, it's likely to stay that way for at least another month. Thus, Apple has just rolled out OS X Mavericks 10.9.5, and with plenty of bug fixes and general performance enhancements, is worth taking the time to download.
