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Firefox Got Faster for Real Users in 2023
(hacks.mozilla.org)
This is a most excellent place for technology news and articles.
What if you delete all your bookmarks? Does that help?
What about deleting all bookmarks, reinstall Firefox then sync account with no bookmarks.
What about exporting bookmarks and adding them to a fresh Firefox without a profile.
I think bookmarks are part of the issue but not whole. It's been more than a year since I tried debugging this and gave up. My machine doesn't get shut down often and this wait happens only on fresh start. So I kind of learned to live with it.