When viewing the gadget directory, JIRA gathers information about all of the available gadgets. If some of these are served from external sites and the sites themselves are slow or not responding, it will slow the loading of the directory.
Maybe try looking through the gadget directory for any external gadgets, and loading their URLs directly in the browser to find if there are any slow ones?
I also saw a case recently where a JIRA instance was slow to load the directory even though it had no external gadgets at all. A restart fixed it (or at least made the symptom go away). My theory is that it was an issue with the HTTP proxy we were using and that the outbound connection pool was starved. Even though it was only calling itself; with only a few connections available, it was forced to issue all the requests serially.
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