Yes. Confirmed it is a resource issue, but still working on ways to improve performance.
For most sites it only happens on common facts like BIRT For your data FACT is more common than birth! More than 11000 individuals have one or more. Creating the list is quick and easy, but preparing them for display, sorted, filtered, duplicates removed, privacy checked, etc is the problem.
For now try adding further limits to the query, such as date and or place.