Your site's performance, reflected on its page speed insight score, is showing 45. This is unacceptable for a blog; it should be close to 100 for text-based pages like you have. Does the site contain scripts, deep dependency trees, or analytics?
Could this have changed during the performance drop?
No - it's because it's a Docusaurus site and so runs React / JavaScript. It was like this before the drop and so is unlikely to be the cause. It's been Docusaurus for about 2 years now
Could this have changed during the performance drop?