This is not a global setting, but it will help eliminate slowness: in the Project panel, define directories in your project that contain large non-code files, right-click and select "Mark directory as> excluded" from the menu.
My project directory contained the 'log' directory, as well as other directories containing many generated files, and a report directory containing Junit reports, checkstyle, etc. After marking them as excluded, the Find Usages function was much faster, cheers.
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