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NbInstaller looks for localizing bundle, opens it and parses for each module that adds a tools action to make it possible to group these action by module categories. Not a big CPU load but for cold start it means reading of the localizing bundle although we could avoid it. The result is questionable anyway: big Java group but separated from 'JUnit tests', apply diff together with i18n, a group for add to favorites.
Tools actions are semideprecated anyway, and the cost is paid only for modules that have one.