A couple things that may optimize your custom wordpress queries. First there is a parameter called ‘fields’ where you can specify that you only want the ID field back. Something like below:
$some_query = new WP_Query( array( ‘fields’ => ‘ids’ ) );
An even more significant optimization is by caching your data and using WordPress’ Transient API like so:
<?php
// Get any existing copy of our transient data
if ( false === ( $special_query_results = get_transient( ‘special_query_results’ ) ) ) {
// It wasn’t there, so regenerate the data and save the transient
$special_query_results = new WP_Query( ‘cat=5&order=random&tag=tech&post_meta_key=thumbnail’ );
set_transient( ‘special_query_results’, $special_query_results );
}
// Use the data like you would have normally…
?>
sources:
http://www.wpbeginner.com/wp-tutorials/speed-up-your-wordpress-by-caching-custom-queries-using-transients-api/
http://wordpress-hackers.1065353.n5.nabble.com/Using-WP-Query-to-get-posts-ids-td23952.html
http://codex.wordpress.org/Transients_API
keywords: wp_query only get ids, wp_query cache_results
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