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There are some OpenG VIs, like the Variant Configuration File IO VIs, that use the legacy form of recursion (VI Server Call By Reference to self), which is (I believe) much less efficient than using the native recursion feature introduced in LabVIEW 2009. I would recommend changing all VIs that use legacy recursion to use native recursion, provided that a performance improvement would be gained. Here's a screenshot, showing what I mean: