I think first page load is slowest. Could otherwise post HAR, but it contains sensitive session cookie information. For example now dashboard takes 7 seconds to load and think first load after short break will take even many times longer. We use also Bitbucket and it's noticeably faster.
Haven't visit Confluence today and first visit to Confluence frontpage (Welcome to Confluence) loaded over 20 seconds before page was loaded. Network inspector shows it took 2.1 minutes to load everything. Second visit on same page is much faster.
The second time you load the page, it loads faster because much of the data is cached, however it sounds like the root cause remains. You may want to create a support ticket at support.atlassian.com so we can take a deeper look at your instance.
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