I'm really confused as to what's causing this, but my VPS is suddenly running at 100% CPU most of the time. The main culprits are both WordPress php files: index.php and wp-cron.php on my main Multisite. These weren't a problem in the past, so I'm confused as to why they suddenly are an issue. I'm working with my host's support, but they're Linux/Hosting experts, not necessarily WordPress experts. So I hoped somebody here might have some ideas.