Hi guys. I have switched from Plesk on Windows to Plesk on Linux. It was lightening fast after installation on a VPS with 80GB SSD, E5-2620 CPU and 4GB of ram. It's set to auto update the panel; so it always updated the minor version changes; nothing new has been installed on CentOS box. After a couple of weeks; Plesk has gone so slow. Any operation or anywhere clicked on the panel makes me wait a couple of seconds. I have approx 20 web sites hosted but all of them have nearly zero traffic; because I'm using this VPS as a development box. I decided to upgrade to Onyx and have been using it for about a month; but it's all the same. Now I upgrade from 17.0 to 17.5. Still the same. I don't know what has changed between now and the time it was really fast; because I haven't installed anything manually on the server. How to diagnose this problem? Note: General CPU usage is between 0% -5%.