Blocking time boils down to the amount of time the users browser spends executing javascript, which is why we recommend avoiding javascript as much as possible.
Our current setup uses the Modern Mobile Menu instead of the theme's javascript menu to eliminate blocking time.
The Modern Recipe Index and Modern Sidebar are basic WordPress page that doesn't incorporate drop-downs or javascript-based filters.
Javascript that loads intelligently - either deferred by WP Rocket or using the intersection observer - can be fine, but this can get very technical and requires paid expert help.
This blocking time post from isotropic.com dives into ways to identify and fix blocking time.
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