The page content is fetched several times on page load/change

We can observe many similar queries being done to fetch page content.
This is not optimal because:

• it's adding unnecessary load on the server
• it's adding unnecessary network traffic which is bad in case of slow network, slow server or large page content

Reproduction steps

1. Visit a page
2. Check the number of requests to fetch pages data (e.g., <domain>/xwiki/rest/cristal/page?media=json&page=Sandbox.WebHome&format=jsonld for a XWiki backend)

Expected

1. one query on page load
2. one query on page change

Actual

1. 3 queries on page load
2. 3 queries on page change