We installed JA Blockk 17 hours ago. There was an immediate critical increase in CPU usage and increased Entry Processes. See Yellow Box on attachment 1.png
We disabled two key extensions leaving bare bones. The improvement was minimal.
Three hours ago we wanted to remove index.php from the logo URL and so we made a simple, one-line mod rewrite in DOT-htaccess file. The mod rewrite didn't work BUT the memory issues disappeared completely. See blue Box on Attachment 1. The side effect to the bad mod rewrite was the drop-down menus didn't work (main menu) so we restored DOThtaccess and the CPU usage skyrocketed again.