Performance improvement proposal (core and support level changes)

I propose to implement this in the basic Wodrpress functions so that they can be simply activated or not activated (with checkboxes in the settings section):

• Intersection Observer API
• Mutation Observer API
• Speculative Loading (integrate the functionality of this plugin into the basic system – https://wordpress.org/plugins/speculation-rules/)
• PWA – (integrate the functionality of this plugin into the basic system – https://wordpress.org/plugins/pwa/)

Use CSS content-visibility in standard Wodrpress themes https://web.dev/blog/css-content-visibility-baseline

PS. This will allow you to use fewer plugins and your own code, speed up site loading, improve security