Fix performance: unused and blocking resources#2840
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Fixes #2679
There are some unused resources loaded by plugins which impact FCP and LCP:
Note that dashicons CSS also affects load performance, but can't be removed while the admin bar is always shown for login/registration.
This PR improves loading performance by:
There is still a large performance hit from loading the WordPress components package for the locale switcher but this will be addressed separately. If TranslatePress is adopted the locale switcher may not be necessary at all, or otherwise we might want to rewrite it using native web UI components.