for our internal team we are running Moodle instances on a Linux - server (Ubuntu 16.04).
Since a month or so more user use the Moodle instances.
We also installed another Moodle - instance which for a Moodle update
process. This instance is not so much in use at the very moment.
Moreover I installed different versions of the Moodle Db.
As a result the performance goes down.
I think I have to dig through the performance recommendation ...
... but do you have a guess where to start in order to find the bottleneck
What are the "normal suspects" ?