Performance Improvement using `content-visibility: auto`

Why not use content-visibility: auto to improve rendering performance?

    content-visibility: auto !important;
    contain-intrinsic-size: 0 200px !important;

[level="1"] is to prevent issues, as other .ls-block are nested inside the level 1s

My experience
I’m curious to know if it’ll help everyone if this is implemented as the default.

The only issue I faced is that hints for page linking when typing between [] does not appear.