@Ronald Verheul It may be something to do with your custom items such as custom fields, or perhaps the page you are trying to load has been overloaded with things.
I would recommend that you click here and open a support ticket with Atlassian, who can help investigate your site and let you know exactly why it is taking so long to load - there may be a technical issue behind the scenes which they can identify
Well, i just tried and got bumped with the friendly message:
"If you need technical support, ask your admin to file a request on your behalf. Only Jira Software admins, billing contacts, and technical contacts can create support requests for Jira Software"
And that won work for me since i have no clue who is our admin and assume our admin himself doesn't know either.
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