Reverting to release notes that make haiku seem wordy, Apple has released something called OS X Mountain Lion 10.8.2 Supplemental Update 2.0 that claims to address “an issue with Keychain that can affect 2012 Mac systems.” It’s recommended for all Macs introduced in 2012, but there’s nothing else that hints at what it fixes or how serious the “issue” might be. It’s available via the App Store’s Updates screen, and if it doesn’t appear for you, it’s presumably not necessary for your Mac. (Free, 26.65 MB)
Avoid Long Hierarchical Menus
If you right-click (or Control-click) on some item, such as a file in the Finder, and one of the sub-menus has many options (Open With is a frequent culprit), it may take several seconds to open, even on a fast machine, which is annoying if you did not actually want that sub-menu.
The trick is to not pull the cursor through the menu, but in a curve around it, so the cursor does not touch any menu items until lower on the list where you wanted to go.
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OS X Mountain Lion 10.8.2 Supplemental Update 2.0
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