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+:mod:`sphinx.ext.duration` -- Measure durations of Sphinx processing
+====================================================================
+
+.. module:: sphinx.ext.duration
+ :synopsis: Measure durations of Sphinx processing
+
+.. versionadded:: 2.4
+
+This extension measures durations of Sphinx processing and show its
+result at end of the build. It is useful for inspecting what document
+is slowly built.