Description

Initially started in WordPress/wordpress-develop#3655.

The method currently returns a full WP_Post array while later only the ID and post_content fields are used. That's causing a lot of unnecessary overhead.

To fix this the WP_Query should be updated to disable update_post_meta_cache and update_post_term_cache. Also, any get_post( $x, ARRAY_A ); calls should be changed to just get_post( $x ) so that WP_Post::to_array() isn't called, preventing post meta lookups. Then we can create a custom array that only includes the two fields ID and post_content as proposed by @spacedmonkey.

Step-by-step reproduction instructions

See code in https://github.com/WordPress/wordpress-develop/blob/95d11878b0d3ed89c05ae894754374620ffae1bd/src/wp-includes/class-wp-theme-json-resolver.php#L411.

Screenshots, screen recording, code snippet

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Environment info

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Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes