Dear Marcus,
First, let me thank you for all your help in the past, I never contacted you but your replies to other posts have been very helpful when we encountered similar issues.
Our Moodle vertuion is 3.9, with approximtly 6000 useres. At the time we are using the default blank theme. On campus when we open any other site it loads fast. When we use Moodle it is very slow to navigate moving between pages adding
activities resources or performing any Moodle task takes a long time. I have tried to include as many details as possible please let me know what I can add.