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In Lookup initialization XMLDataLoader creates DataObjects for content/unknown mime-type. Perhaps this is not needed and it caused visible slow-down (in profiler).
Created attachment 76802 [details] Patch - used when trying to ensure performance gain
Created attachment 76804 [details] Profiler Snapshot
Created attachment 76805 [details] XMLDataObject
Created attachment 76806 [details] XMLDataLoader
The creation of this loader is unfortunate, but probably not cause for 157829, as has been originally thought.
seems to work for a file with unknown extension (7.4dev)