Overall performance is a little slower, especially the logging out process, which takes up to 20 seconds, normally this would take 2 seconds. Sessions are stored in Database.
The webserver is hitting 100cpu under a light load, mysql server fine though. PHP error logs not much there.
Any suggestions why logging out is struggling or webserver cpu spiking under light load?
Here's a ZendOPcache file info screenshot in case that helps,
(other Server Environment checks all OK too.)