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CSS

Skip Rendering Off-Screen Comments and Footers Until Needed

Uses the CSS content-visibility property so browsers skip laying out the comments section, footer and related posts until the visitor scrolls near them, which speeds up rendering of long pages.

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Code

#comments,
.comments-area,
.wp-block-comments,
.site-footer,
footer.wp-block-template-part,
.related-posts,
.jp-relatedposts {
    content-visibility: auto;
    contain-intrinsic-size: auto 800px;
}

Notes

Adjust the selectors to your theme; the size hint keeps the scrollbar from jumping.

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