jquery.min has very long TTFB

I have noticed recently some plugins like Jetpack, Yoast and Wordfence in my WordPress admin take a long time to load. I investigated the issue in Chrome console and noticed the TTFB to load jquery.min is very long.

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An example of a URL it is loading is https://c0.wp.com/c/5.7/wp-includes/js/jquery/jquery.min.js – what is causing the long delay?