I have had a problem where despite only 9 visitors to a site, my CPU usage went to 100%. Upon investigation, my host said that the file at wp-admin/load-styles.php was the one that was hung up and causing the traffic jam. This happened on about 13 other sites that are set up the same way. Latest WP, latest DIVI theme, PHP 8.1, and only two plugins — LiteSpeed which was not installed by me and GROW social sharing icons.
I keep only one extra theme in the admin and clean up all old saved pages in the DIVI library.
The host cleared the ‘requests’ from wp-admin/load-styles.php and the site was restored, but I wonder how a single page can get hung up like that to the point it taxes the CPU usage? The other sites eventually cleared up on their own.
I’m baffled.