Our Connection Properties have always been set to "Never Check". We use a local address locator in the DefaultLocators.xml and have disabled the check for ArcGIS services in this file. The delayed "Find" tool response is worst if we start a new session of ArcMap. If we've already started ArcMap and open a new document, the delay is not as long. This mysterious behavior started recently and we have not changed any settings in ArcMap. There was however a Windows 10 update and we've been suspecting a connection. But can not understand how that can be related.
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