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It looks like in the latest release you have commented out cache code from here: https://plugins.trac.wordpress.org/changeset/2129932/wp-facebook-pixel/trunk/inc/NSAUtilities.php
//$cache = get_transient($post_type.'_meta_keys');
//if($cache) return $cache;
This is causing these expensive SQL queries to run all the time with a big performance hit.
Can you add the cache code back in?