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Sublime Text 2 is among the fastest editors as it is and Sublime Text 3 promises to improve the start-up time to become even faster.
Pro Powerful plugin system
Sublime Text supports a large number of languages and general text editing features out of the box, but its most useful feature is its extensibility - Sublime Text uses TextMate's syntax declaration files to support new languages, has all its menus and keybindings generated from JSON files, and can be scripted to add new features using Python.
Pro Consistent cross-platform
Looks consistently the same across Windows, OS X and Linux.
Con Few releases
Sublime Text 3 is in Beta since June 2013 but the latest Dev version of Sublime Text 3 was released in Februrary 2016.