The attached shows the long blue pause is the index.php file in an EE7 site. This 'pause' is sometimes over 15 seconds. This happens during page update/create, implying a MySQL issue. Server has loads of spare resources, no errors in MySQL/Apache/PHP. This is random, sometimes it update/create is instant, sometimes delayed.
In the past I would lean on NewRelic to profile these requests, but I am wondering if there is something better or newer?