WordPress Architecture & High-Performance WP_Query Quiz

It automatically disables caching for fresh results It skips SQL_CALC_FOUND_ROWS, drastically reducing query overhead when pagination is not required It deletes old post revisions from the database It prevents meta_query from executing

Drop all indexes to save disk space Add a composite index on (post_id, meta_key) or separate optimized custom database table for high-volume attributes Rely solely on WordPress default single index Run raw SQL without prepared statements

wp_reset_query() wp_reset_postdata() wp_die() flush_rewrite_rules()

htmlspecialchars() only sanitize_text_field() or prepared statements with $wpdb->prepare() strip_tags() only base64_encode()